docs: db type mappings #2038

Job	Run time
Build `sea-query-binder` (async-std, rustls)	1m 46s
Build `sea-query-postgres`	48s
Clippy	54s
Build `sea-query`	44s
Build `sea-query-rusqlite`	42s
Rustfmt	18s
Derive Tests	40s
Unit Test	1m 33s
SQLite (rusqlite)	41s
MariaDB (10.6, sqlx_mysql)	1m 18s
SQLite (sqlx_sqlite)	49s
Any	1m 10s
MySQL (8, sqlx_mysql)	1m 17s
MySQL (5.7, sqlx_mysql)	1m 38s
PostgreSQL (14.4, postgres)	55s
PostgreSQL (14.4, sqlx_postgres)	1m 18s
PostgreSQL (13.7, postgres)	2m 6s
PostgreSQL (13.7, sqlx_postgres)	1m 19s
PostgreSQL (12.11, postgres)	49s
PostgreSQL (12.11, sqlx_postgres)	1m 10s
	21m 55s

Provide feedback