Add `ExprTrait` (#771) #2144

Job	Run time
Build `sea-query`	39s
Clippy	43s
Build `sea-query-binder` (async-std, rustls)	1m 49s
Build `sea-query-postgres`	33s
Build `sea-query-rusqlite`	28s
Rustfmt	15s
Unit Test	1m 28s
Derive Tests	40s
MariaDB (10.6, sqlx_mysql)	1m 15s
Any	58s
PostgreSQL (14.4, postgres)	50s
MySQL (8, sqlx_mysql)	1m 22s
PostgreSQL (14.4, sqlx_postgres)	1m 8s
SQLite (rusqlite)	19s
MySQL (5.7, sqlx_mysql)	1m 15s
PostgreSQL (13.7, postgres)	42s
SQLite (sqlx_sqlite)	45s
PostgreSQL (13.7, sqlx_postgres)	1m 6s
PostgreSQL (12.11, postgres)	52s
PostgreSQL (12.11, sqlx_postgres)	1m 10s
	18m 17s

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