Enhance documentation and examples for FastAPI Pub/Sub integration wi… #150

Job	Run time
Test pgmq-sqlalchemy (Python 3.9, Driver psycopg)	3m 46s
Test pgmq-sqlalchemy (Python 3.9, Driver asyncpg)	2m 28s
Test pgmq-sqlalchemy (Python 3.12, Driver pg8000)	4m 41s
Test pgmq-sqlalchemy (Python 3.9, Driver psycopg2)	3m 41s
Test pgmq-sqlalchemy (Python 3.11, Driver psycopg2cffi)	3m 41s
Test pgmq-sqlalchemy (Python 3.11, Driver pg8000)	4m 39s
Test pgmq-sqlalchemy (Python 3.10, Driver psycopg2cffi)	3m 40s
Test pgmq-sqlalchemy (Python 3.10, Driver psycopg2)	3m 38s
Test pgmq-sqlalchemy (Python 3.10, Driver psycopg)	3m 44s
Test pgmq-sqlalchemy (Python 3.9, Driver pg8000)	4m 35s
Test pgmq-sqlalchemy (Python 3.11, Driver psycopg)	4m 1s
Test pgmq-sqlalchemy (Python 3.12, Driver psycopg)	3m 42s
Test pgmq-sqlalchemy (Python 3.10, Driver pg8000)	4m 44s
Test pgmq-sqlalchemy (Python 3.12, Driver psycopg2cffi)	3m 40s
Test pgmq-sqlalchemy (Python 3.11, Driver asyncpg)	2m 21s
Test pgmq-sqlalchemy (Python 3.11, Driver psycopg2)	3m 35s
Test pgmq-sqlalchemy (Python 3.12, Driver psycopg2)	3m 43s
Test pgmq-sqlalchemy (Python 3.12, Driver asyncpg)	2m 28s
Test pgmq-sqlalchemy (Python 3.10, Driver asyncpg)	2m 20s
Test pgmq-sqlalchemy (Python 3.9, Driver psycopg2cffi)	3m 44s
Upload coverage to Codecov	10s
	1h 13m 1s

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