Add SyncConnectionWrapper type #210

Job	Run time
Check rustfmt style && run clippy	48s
Check Minimal supported rust version (1.65.0)	45s
Check (stable, postgres, ubuntu-latest)	1m 4s
Check (stable, postgres, macos-latest)	1m 11s
Check (stable, postgres, windows-latest)	12m 36s
Check (stable, mysql, ubuntu-latest)	3m 27s
Check (stable, mysql, macos-latest)	19s
Check (stable, mysql, windows-latest)	7m 28s
Check (beta, postgres, ubuntu-latest)	1m 10s
Check (beta, postgres, macos-latest)	1m 10s
Check (beta, postgres, windows-latest)	17m 14s
Check (beta, mysql, ubuntu-latest)	3m 24s
Check (beta, mysql, macos-latest)	23s
Check (beta, mysql, windows-latest)	7m 36s
Check (nightly, postgres, ubuntu-latest)	1m 7s
Check (nightly, postgres, macos-latest)	1m 40s
Check (nightly, postgres, windows-latest)	18m 54s
Check (nightly, mysql, ubuntu-latest)	3m 36s
Check (nightly, mysql, macos-latest)	12s
Check (nightly, mysql, windows-latest)	8m 44s
	1h 32m 48s

Provide feedback