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**Description**

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Make `MongoToS3Operator` `mongo_collection` parameter templated.

**Use case / motivation**

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This would allow for passing a templated mongo collection from other tasks, such as a mongo collection used as data destination by using `S3Hook`. For instance, we could use templated mongo collection to write data for different dates in different collections by using: `mycollection.{{ ds_nodash }}`.

**Are you willing to submit a PR?**

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Yes.

**Related Issues**

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N/A

airflow/providers/amazon/aws/transfers/mongo_to_s3.py
#
#
#
import json
from typing import Any, Iterable, Optional, Union, cast
from bson import json_util
from airflow.models import BaseOperator
from airflow.providers.amazon.aws.hooks.s3 import S3Hook
from airflow.providers.mongo.hooks.mongo import MongoHook
from airflow.utils.decorators import apply_defaults
class MongoToS3Operator(BaseOperator):
    """
    Mongo -> S3
        A more specific baseOperator meant to move data
        from mongo via pymongo to s3 via boto
        things to note
                .execute() is written to depend on .transform()
                .transform() is meant to be extended by child classes
                to perform transformations unique to those operators needs
    """
    template_fields = ['s3_key', 'mongo_query']
    
    @apply_defaults
    def __init__(