SQLx

Address clippy warnings and add to gh actions #292

Job	Run time
Format	10s
Check (async-std, native-tls)	33s
Check (async-std, rustls)	51s
Check (tokio, rustls)	35s
Check (tokio, native-tls)	30s
Unit Test (tokio, rustls)	50s
CLI Binaries (windows-latest)	1m 5s
CLI Binaries (ubuntu-latest)	31s
Postgres	0s
SQLite	0s
Postgres with SSL client cert	0s
MSSQL	0s
MySQL	0s
MariaDB	0s
	5m 5s

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