### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

DynamoDB does not correctly namespace resources based on region and account ID. 

For instance, using the same table name across accounts and regions throws an error.

### Expected Behavior

It must be possible to create resources with same name on different regions and/or different accounts.

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

```
  $ AWS_ACCESS_KEY_ID=445500880268 AWS_DEFAULT_REGION=eu-central-1 \
    awslocal dynamodb create-table --table-name CertificateTargets-local1 \
        --key-schema AttributeName=target_uuid,KeyType=HASH \
        --attribute-definitions AttributeName=target_uuid,AttributeType=S \
        --provisioned-throughput ReadCapacityUnits=1000,WriteCapacityUnits=1000

  $ AWS_ACCESS_KEY_ID=445500880268 AWS_DEFAULT_REGION=us-east-1 \
    awslocal dynamodb create-table --table-name CertificateTargets-local1 \
        --key-schema AttributeName=target_uuid,KeyType=HASH \
        --attribute-definitions AttributeName=target_uuid,AttributeType=S \
        --provisioned-throughput ReadCapacityUnits=1000,WriteCapacityUnits=1000

    # ResourceInUseException!

  $ AWS_ACCESS_KEY_ID=000000000000 \
    awslocal dynamodb create-table --table-name CertificateTargets-local1 \
        --key-schema AttributeName=target_uuid,KeyType=HASH \
        --attribute-definitions AttributeName=target_uuid,AttributeType=S \
        --provisioned-throughput ReadCapacityUnits=1000,WriteCapacityUnits=1000

    # ResourceInUseException!
```

### Environment

```markdown
OS: Ubuntu 22.04
LocalStack: latest
```


### Anything else?

_No response_
@classmethod
    def extract_keys(cls, item: Dict, table_name: str) -> Optional[Dict]:
        key_schema = cls.get_key_schema(table_name)
        return cls.extract_keys_for_schema(item, key_schema)
    @classmethod
    def extract_keys_for_schema(cls, item: Dict, key_schema: List[Dict]):
        result = {}
        for key in key_schema:
            attr_name = key["AttributeName"]
            if attr_name not in item:
                raise JsonRESTError(
                    error_type="ValidationException",
                    message="One of the required keys was not given a value",
                )
            result[attr_name] = item[attr_name]
        return result
    @classmethod
    def get_key_schema(cls, table_name: str) -> Optional[List[Dict]]:
        from localstack.services.dynamodb.provider import get_store
        table_definitions: Dict = get_store().table_definitions
        table_def = table_definitions.get(table_name)
        if not table_def:
            raise ResourceNotFoundException(
                f"Unknown table: {table_name} not found in {table_definitions.keys()}"
            )
        return table_def["KeySchema"]
    @classmethod
    def get_table_schema(cls, table_name):