Let `last_insert_id` optional and flexible. #4476

Job	Run time
Clippy	34s
Rustfmt	21s
Examples (examples/actix_example)	44s
Init	5s
Examples (examples/axum_example)	44s
Unit Test	43s
Examples (examples/basic)	43s
Examples (examples/graphql_example)	44s
Examples (examples/jsonrpsee_example)	44s
Examples (examples/loco_example)	43s
Examples (examples/loco_starter)	43s
Examples (examples/loco_seaography)	44s
Examples (examples/poem_example)	43s
Examples (examples/proxy_gluesql_example)	33s
Examples (examples/react_admin)	44s
Examples (examples/rocket_example)	43s
Examples (examples/rocket_okapi_example)	32s
Examples (examples/salvo_example)	43s
Examples (examples/seaography_example)	44s
Examples (examples/tonic_example)	1m 14s
Compile PostgreSQL (tokio, native-tls)	1s
Compile MySQL (actix, native-tls)	29s
Compile SQLite (async-std, native-tls)	1s
Compile PostgreSQL (tokio, rustls)	1s
CLI	0s
Compile MySQL (actix, rustls)	1s
Compile SQLite (async-std, rustls)	1s
Issues Matrix	0s
Issues	0s
SQLite	1s
Postgres	1s
MariaDB	1s
MySQL	1s
	14m 6s

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