Add method for retrieiving column names #4135

Job	Run time
Init	4s
Rustfmt	16s
Clippy	1m 13s
Examples (examples/actix_example)	2m 34s
Unit Test	3m 20s
Examples (examples/actix3_example)	2m 41s
Examples (examples/axum_example)	2m 36s
Examples (examples/basic)	1m 9s
Examples (examples/graphql_example)	2m 49s
Examples (examples/jsonrpsee_example)	2m 32s
Examples (examples/loco_example)	3m 18s
Examples (examples/poem_example)	2m 33s
Examples (examples/proxy_gluesql_example)	1m 19s
Examples (examples/rocket_example)	3m 39s
Examples (examples/rocket_okapi_example)	3m 12s
Examples (examples/salvo_example)	3m 34s
Examples (examples/seaography_example)	2m 32s
Examples (examples/tonic_example)	2m 34s
Compile PostgreSQL (tokio, native-tls)	3m 8s
Compile SQLite (async-std, native-tls)	2m 50s
Compile MySQL (actix, native-tls)	2m 44s
Compile PostgreSQL (tokio, rustls)	3m 18s
Compile SQLite (async-std, rustls)	3m 7s
CLI	0s
Compile MySQL (actix, rustls)	3m 6s
Issues Matrix	0s
Issues	0s
MariaDB (10.6, actix, native-tls)	2m 27s
MySQL (8, actix, native-tls)	3m 29s
MySQL (5.7, actix, native-tls)	3m 37s
Postgres (14.4, tokio, native-tls)	7m 12s
SQLite (async-std, native-tls)	4m 15s
SQLite (async-std, rustls)	5m 6s
	1h 26m 14s

Provide feedback