codegen: fix `ColumnType` to Rust type resolution #4371

Job	Run time
Unit Test	3m 15s
Rustfmt	15s
Examples (examples/actix_example)	2m 22s
Clippy	1m 40s
Examples (examples/axum_example)	2m 17s
Init	5s
Examples (examples/basic)	1m 11s
Examples (examples/graphql_example)	2m 35s
Examples (examples/jsonrpsee_example)	2m 26s
Examples (examples/loco_example)	3m 10s
Examples (examples/loco_starter)	3m 38s
Examples (examples/loco_seaography)	3m 49s
Examples (examples/poem_example)	2m 12s
Examples (examples/proxy_gluesql_example)	1m 10s
Examples (examples/rocket_example)	3m 4s
Examples (examples/rocket_okapi_example)	3m 0s
Examples (examples/salvo_example)	3m 15s
Examples (examples/seaography_example)	2m 30s
Examples (examples/tonic_example)	2m 16s
Compile PostgreSQL (tokio, native-tls)	4m 57s
Compile SQLite (async-std, native-tls)	4m 57s
Compile PostgreSQL (tokio, rustls)	5m 16s
Compile SQLite (async-std, rustls)	5m 6s
Compile MySQL (actix, native-tls)	4m 55s
CLI	0s
Compile MySQL (actix, rustls)	4m 59s
Issues Matrix	0s
Issues	0s
SQLite (async-std, native-tls)	4m 21s
SQLite (async-std, rustls)	4m 22s
Postgres (14, tokio, native-tls)	6m 52s
Postgres (16, tokio, native-tls)	7m 1s
MySQL (lts, actix, native-tls)	3m 19s
MariaDB (lts, actix, native-tls)	2m 42s
MySQL (5.7, actix, native-tls)	3m 16s
	1h 46m 13s

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