Add TableMetadataBuilder::assign_current_snapshot_id #1973

Job	Run time
build (ubuntu-latest)	5m 14s
build_with_no_default_features (ubuntu-latest)	1m 29s
check (ubuntu-latest)	5m 48s
build (macos-latest)	5m 37s
build_with_no_default_features (macos-latest)	1m 48s
check (macos-latest)	8m 5s
build (windows-latest)	11m 45s
build_with_no_default_features (windows-latest)	3m 22s
unit	8m 30s
	51m 38s

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