SQLx

Address clippy warnings and add to gh actions #286

Job	Run time
Check (tokio, rustls)	29s
Unit Test (tokio, rustls)	39s
Check (async-std, rustls)	43s
Check (tokio, native-tls)	29s
Check (async-std, native-tls)	42s
Format	6s
CLI Binaries (windows-latest)	1m 54s
CLI Binaries (ubuntu-latest)	44s
MSSQL	0s
MariaDB	0s
Postgres	0s
Postgres with SSL client cert	0s
SQLite	0s
MySQL	0s
	5m 46s

Provide feedback