SQLx

refactor mssql signed int decoding #196

Job	Run time
Check (async-std, native-tls)	54s
Format	6s
CLI Binaries (windows-latest)	1m 55s
CLI Binaries (ubuntu-latest)	1m 55s
Check (async-std, rustls)	54s
Check (tokio, native-tls)	39s
Check (actix, rustls)	49s
Check (tokio, rustls)	39s
Unit Test (tokio, rustls)	53s
Check (actix, native-tls)	45s
SQLite	0s
Postgres	-1s
MySQL	-1s
MSSQL	-1s
Postgres with SSL client cert	-1s
MariaDB	-1s
	9m 24s

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