Made sqlalchemy dependency optional for amazon provider

[justinpakzad]

closes: #59896

Made SQLAlchemy an optional dependency for the Amazon provider. The imports are now wrapped with try/except and AirflowOptionalProviderFeatureException() gets raised if it is not installed.

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[Dev-iL]

@potiuk Please note before approving similar PRs that leaving URL untyped (i.e. URL: Any before the try block) or unignored (# type: ignore[assignment,misc]) leads to mypy violations on SQLA2:

providers/amazon/src/airflow/providers/amazon/aws/hooks/redshift_sql.py:30: error: Cannot assign to a type  [misc]
        URL = create_engine = None
        ^~~
providers/amazon/src/airflow/providers/amazon/aws/hooks/redshift_sql.py:30: error: Incompatible types in assignment (expression has
type "None", variable has type "type[URL]")  [assignment]
        URL = create_engine = None
        ^
providers/amazon/src/airflow/providers/amazon/aws/hooks/redshift_sql.py:30: error: Incompatible types in assignment (expression has
type "None", variable has type overloaded function)  [assignment]
        URL = create_engine = None
                              ^~~~
providers/amazon/src/airflow/providers/amazon/aws/hooks/athena_sql.py:28: error: Cannot assign to a type  [misc]
        URL = None
        ^~~
providers/amazon/src/airflow/providers/amazon/aws/hooks/athena_sql.py:28: error: Incompatible types in assignment (expression has type
"None", variable has type "type[URL]")  [assignment]
        URL = None
              ^~~~

[potiuk]

Ah. That's unfortunate indeed