feat: SQLTarget connector instance shared with sinks #3819

Job	Run time
Test on 3.7 (tests) / ubuntu-latest / SQLAlchemy: 2.*	1m 15s
Test on 3.8 (tests) / ubuntu-latest / SQLAlchemy: 2.*	1m 13s
Test on 3.9 (tests) / ubuntu-latest / SQLAlchemy: 2.*	1m 15s
Test on 3.10 (tests) / ubuntu-latest / SQLAlchemy: 2.*	1m 17s
Test on 3.11 (tests) / ubuntu-latest / SQLAlchemy: 2.*	1m 30s
Test on 3.7 (tests) / macos-latest / SQLAlchemy: 2.*	2m 7s
Test on 3.8 (tests) / macos-latest / SQLAlchemy: 2.*	2m 8s
Test on 3.9 (tests) / macos-latest / SQLAlchemy: 2.*	2m 6s
Test on 3.10 (tests) / macos-latest / SQLAlchemy: 2.*	2m 42s
Test on 3.11 (tests) / macos-latest / SQLAlchemy: 2.*	1m 57s
Test on 3.7 (tests) / windows-latest / SQLAlchemy: 2.*	2m 37s
Test on 3.8 (tests) / windows-latest / SQLAlchemy: 2.*	3m 46s
Test on 3.9 (tests) / windows-latest / SQLAlchemy: 2.*	2m 48s
Test on 3.10 (tests) / windows-latest / SQLAlchemy: 2.*	4m 5s
Test on 3.11 (tests) / windows-latest / SQLAlchemy: 2.*	2m 51s
Test on 3.11 (tests) / ubuntu-latest / SQLAlchemy: 1.*	1m 12s
Test on 3.10 (doctest) / ubuntu-latest / SQLAlchemy: 2.*	57s
Test on 3.8 (mypy) / ubuntu-latest / SQLAlchemy: 2.*	1m 2s
External Tests	0s
Coverage	41s
	37m 29s

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