SQLx

Address clippy warnings and add to gh actions #291

Job	Run time
Check (async-std, native-tls)	37s
CLI Binaries (ubuntu-latest)	30s
CLI Binaries (windows-latest)	40s
Check (tokio, rustls)	32s
Check (tokio, native-tls)	34s
Check (async-std, rustls)	41s
Unit Test (tokio, rustls)	23s
Format	10s
MariaDB	0s
Postgres	0s
SQLite	0s
MSSQL	0s
Postgres with SSL client cert	0s
MySQL	0s
	4m 7s

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