`DatabaseConnection` directly from `PgPool` (#2348) #4436

Job	Run time
Rustfmt	19s
Init	4s
Clippy	1m 13s
Examples (examples/actix_example)	2m 29s
Examples (examples/axum_example)	2m 26s
Unit Test	3m 11s
Examples (examples/basic)	1m 25s
Examples (examples/graphql_example)	2m 44s
Examples (examples/jsonrpsee_example)	2m 37s
Examples (examples/poem_example)	2m 21s
Examples (examples/proxy_gluesql_example)	1m 29s
Examples (examples/rocket_example)	3m 18s
Examples (examples/rocket_okapi_example)	3m 28s
Examples (examples/salvo_example)	2m 41s
Examples (examples/seaography_example)	2m 32s
Examples (examples/tonic_example)	2m 39s
Compile MySQL (actix, native-tls)	2m 52s
Compile MySQL (actix, rustls)	3m 8s
Compile PostgreSQL (tokio, native-tls)	2m 58s
Compile SQLite (async-std, native-tls)	3m 4s
Compile PostgreSQL (tokio, rustls)	3m 5s
CLI	0s
Compile SQLite (async-std, rustls)	2m 54s
Issues Matrix	0s
Issues	0s
MySQL (lts, actix, native-tls)	3m 40s
MariaDB (lts, actix, native-tls)	2m 53s
MySQL (5.7, actix, native-tls)	3m 19s
Postgres (14, tokio, native-tls)	6m 58s
Postgres (16, tokio, native-tls)	6m 57s
SQLite (async-std, native-tls)	4m 38s
SQLite (async-std, rustls)	4m 42s
	1h 26m 4s

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