Added validate function to PgConfig and invoked it in finalize and pool initialization #3317

Job	Run time
Build and test docker images	5m 22s
Build aarch64-apple-darwin	1m 14s
Build debian-x86_64	58s
Lint and Unit test	1m 0s
Build x86_64-apple-darwin	1m 12s
Build x86_64-pc-windows-msvc	57s
Build x86_64-unknown-linux-gnu	1m 13s
Test on ${{ matrix.os }}	0s
Test postgis:${{ matrix.img_ver }} sslmode=${{ matrix.sslmode }}	0s
Test AWS Lambda	0s
Package	0s
CI Finished	0s
	11m 56s

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