Add docs page for `SQLAlchemyTableRetriever` component

[bilgeyucel]

Code link: https://github.com/deepset-ai/haystack-core-integrations/blob/main/integrations/sqlalchemy/src/haystack_integrations/components/retrievers/sqlalchemy/sqlalchemy_table_retriever.py

[Aarkin7]

Opened PR #11814 with the new SQLAlchemyTableRetriever guide page