### Body

Spun out of https://github.com/apache/airflow/pull/19665#discussion_r760469246

**Info:**
Currently operators in Amazon provider has a structure of operator per file ([link](https://github.com/apache/airflow/tree/35be8bdee0cdd3e5c73270b0b65e0552fb9d9946/airflow/providers/amazon/aws/operators)) A single service S3 has 7 operators files! This makes it very hard to discover classes.
The proposed structure is what we have for GCP ([link](https://github.com/apache/airflow/tree/35be8bdee0cdd3e5c73270b0b65e0552fb9d9946/airflow/providers/google/cloud/operators)) where file is created for a service and all operators for that services are in a single file.


**Proposed changes:**


**Operators:**

files that don't require changes:

athena.py
batch.py
cloud_formation.py
datasync.py
ecs.py
eks.py
glacier.py
glue.py
glue_crawler.py
redshift.py
sns.py
sqs.py

files that require changes:

|                Current                	|        New       	|
|:-------------------------------------:	|:----------------:	|
|           dms_create_task.py          	|      dms.py      	|
|           dms_delete_task.py          	|      dms.py      	|
|         dms_describe_tasks.py         	|      dms.py      	|
|           dms_start_task.py           	|      dms.py      	|
|            dms_stop_task.py           	|      dms.py      	|
|         ec2_start_instance.py         	|      ec2.py      	|
|          ec2_stop_instance.py         	|      ec2.py      	|
|            emr_add_steps.py           	|      emr.py      	|
|           emr_containers.py           	|      emr.py      	|
|         emr_create_job_flow.py        	|      emr.py      	|
|         emr_modify_cluster.py         	|      emr.py      	|
|       emr_terminate_job_flow.py       	|      emr.py      	|
|              s3_bucket.py             	|       s3.py      	|
|          s3_bucket_tagging.py         	|       s3.py      	|
|           s3_copy_object.py           	|       s3.py      	|
|          s3_delete_objects.py         	|       s3.py      	|
|          s3_file_transform.py         	|       s3.py      	|
|               s3_list.py              	|       s3.py      	|
|          s3_list_prefixes.py          	|       s3.py      	|
|           sagemaker_base.py           	|   sagemaker.py   	|
|         sagemaker_endpoint.py         	|   sagemaker.py   	|
|      sagemaker_endpoint_config.py     	|   sagemaker.py   	|
|           sagemaker_model.py          	|   sagemaker.py   	|
|        sagemaker_processing.py        	|   sagemaker.py   	|
|         sagemaker_training.py         	|   sagemaker.py   	|
|         sagemaker_transform.py        	|   sagemaker.py   	|
|          sagemaker_tuning.py          	|   sagemaker.py   	|
| step_function_get_execution_output.py 	| step_function.py 	|
|    step_function_start_execution.py   	| step_function.py 	|


**Sensors:**

files that don't require changes:

athena.py
batch.py
cloud_formation.py
eks.py
glacier.py
glue.py
glue_crawler.py
redshift.py
sqs.py

files that require changes:

|           Current          	|        New       	|          Note          	|
|:--------------------------:	|:----------------:	|:----------------------:	|
|         dms_task.py        	|      dms.py      	|                        	|
|    ec2_instance_state.py   	|      ec2.py      	|                        	|
|         emr_base.py        	|      emr.py      	|                        	|
|      emr_containers.py     	|      emr.py      	|                        	|
|       emr_job_flow.py      	|      emr.py      	|                        	|
|         emr_step.py        	|      emr.py      	|                        	|
|  glue_catalog_partition.py 	|      glue.py     	| New file already exist 	|
|          s3_key.py         	|       s3.py      	|                        	|
|    s3_keys_unchanged.py    	|       s3.py      	|                        	|
|        s3_prefix.py        	|       s3.py      	|                        	|
|      sagemaker_base.py     	|   sagemaker.py   	|                        	|
|    sagemaker_endpoint.py   	|   sagemaker.py   	|                        	|
|    sagemaker_training.py   	|   sagemaker.py   	|                        	|
|   sagemaker_transform.py   	|   sagemaker.py   	|                        	|
|     sagemaker_tuning.py    	|   sagemaker.py   	|                        	|
| step_function_execution.py 	| step_function.py 	|                        	|


**Action items:**
Create new files and deprecate old ones. This is a backward compatible change.
old file should raise deprecation warnings.

- [x] operators/dms.py @bhavaniravi  https://github.com/apache/airflow/pull/20156
- [x] operators/ec2.py @eladkal  https://github.com/apache/airflow/pull/20157
- [x] operators/emr.py @bhavaniravi https://github.com/apache/airflow/pull/20160
- [x] operators/s3.py @KennyRich https://github.com/apache/airflow/pull/20167
- [x] operators/sagemaker.py @bhavaniravi https://github.com/apache/airflow/pull/20370
- [x] operators/step_function.py @bhavaniravi https://github.com/apache/airflow/pull/20158
- [x] sensors/dms.py @bhavaniravi https://github.com/apache/airflow/pull/20156
- [x] sensors/ec2.py @eladkal  https://github.com/apache/airflow/pull/20157
- [x] sensors/emr.py @bhavaniravi https://github.com/apache/airflow/pull/20160
- ~~[ ] sensors/glue.py  @eladkal On hold as we don't know if this really required. Will be revisited in the future if needed~~
- [x] sensors/s3.py @KennyRich https://github.com/apache/airflow/pull/20167
- [x] sensors/sagemaker.py @bhavaniravi https://github.com/apache/airflow/pull/20370
- [x] sensors/step_function.py @bhavaniravi https://github.com/apache/airflow/pull/20158


FYI @dstandish @ferruzzi @o-nikolas @dbarrundiag 

### Committer

- [X] I acknowledge that I am a maintainer/committer of the Apache Airflow project.
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