SQLx

Address clippy warnings and add to gh actions #296

Job	Run time
Format	7s
Check (tokio, rustls)	1m 45s
Unit Test (tokio, rustls)	1m 8s
Check (tokio, native-tls)	1m 56s
Check (async-std, rustls)	2m 0s
CLI Binaries (windows-latest)	1m 44s
CLI Binaries (ubuntu-latest)	29s
Check (async-std, native-tls)	1m 50s
Postgres	0s
MSSQL	0s
MariaDB	0s
SQLite	0s
MySQL	0s
Postgres with SSL client cert	0s
	10m 59s

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