SQLx

Address clippy warnings and add to gh actions #275

Job	Run time
Clippy (async-std, native-tls)	48s
Clippy (async-std, rustls)	43s
Check (async-std, native-tls)	30s
Check (tokio, native-tls)	33s
Check (async-std, rustls)	9s
Clippy (tokio, native-tls)	40s
Unit Test (tokio, rustls)	26s
Clippy (tokio, rustls)	35s
CLI Binaries (windows-latest)	1m 7s
Check (tokio, rustls)	2m 22s
Format	9s
CLI Binaries (ubuntu-latest)	29s
MariaDB	0s
Postgres	0s
Postgres with SSL client cert	0s
MSSQL	0s
MySQL	0s
SQLite	0s
Clippy per Database	0s
	8m 31s

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