Add SyncConnectionWrapper type #207

Job	Run time
Check Minimal supported rust version (1.65.0)	25s
Check rustfmt style && run clippy	5s
Check (stable, postgres, ubuntu-latest)	24s
Check (stable, postgres, macos-latest)	25s
Check (stable, postgres, windows-latest)	9m 1s
Check (stable, mysql, ubuntu-latest)	24s
Check (stable, mysql, macos-latest)	14s
Check (stable, mysql, windows-latest)	2m 25s
Check (beta, postgres, ubuntu-latest)	38s
Check (beta, postgres, macos-latest)	35s
Check (beta, postgres, windows-latest)	7m 19s
Check (beta, mysql, ubuntu-latest)	15s
Check (beta, mysql, macos-latest)	13s
Check (beta, mysql, windows-latest)	2m 11s
Check (nightly, postgres, ubuntu-latest)	34s
Check (nightly, postgres, macos-latest)	38s
Check (nightly, postgres, windows-latest)	6m 1s
Check (nightly, mysql, ubuntu-latest)	16s
Check (nightly, mysql, macos-latest)	16s
Check (nightly, mysql, windows-latest)	2m 0s
	34m 19s

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