`DatabaseConnection` directly from `PgPool` #4435

Job	Run time
Rustfmt	17s
Clippy	1m 22s
Init	3s
Examples (examples/actix_example)	2m 30s
Unit Test	3m 11s
Examples (examples/axum_example)	2m 24s
Examples (examples/basic)	1m 9s
Examples (examples/graphql_example)	3m 2s
Examples (examples/jsonrpsee_example)	2m 38s
Examples (examples/poem_example)	2m 37s
Examples (examples/proxy_gluesql_example)	1m 29s
Examples (examples/rocket_example)	3m 3s
Examples (examples/rocket_okapi_example)	3m 11s
Examples (examples/salvo_example)	2m 52s
Examples (examples/seaography_example)	2m 32s
Examples (examples/tonic_example)	2m 37s
Compile MySQL (actix, native-tls)	3m 6s
Compile MySQL (actix, rustls)	3m 4s
Compile SQLite (async-std, native-tls)	3m 1s
Compile PostgreSQL (tokio, native-tls)	2m 57s
CLI	0s
Compile SQLite (async-std, rustls)	3m 11s
Compile PostgreSQL (tokio, rustls)	3m 7s
Issues Matrix	0s
Issues	0s
MariaDB (lts, actix, native-tls)	2m 27s
MySQL (lts, actix, native-tls)	3m 20s
MySQL (5.7, actix, native-tls)	3m 58s
Postgres (14, tokio, native-tls)	6m 44s
Postgres (16, tokio, native-tls)	7m 14s
SQLite (async-std, native-tls)	4m 24s
SQLite (async-std, rustls)	4m 34s
	1h 26m 4s

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