refactor(any): Implement fetch_optional in terms of fetch_many #1417

Job	Run time
Functional Test (PostgreSQL)	53s
Check	1m 52s
Functional Test (MySQL)	1m 4s
Integration Test (macOS-13)	2m 47s
Integration Test (ubuntu-latest)	48s
Functional Test (SQLite)	52s
Integration Test (macOS-latest)	57s
Build (macOS-latest)	55s
Build (windows-latest)	2m 42s
Build (ubuntu-latest)	54s
Build (macOS-13)	1m 28s
	15m 12s

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