refactor(any): Implement fetch_optional in terms of fetch_many #1402

Job	Run time
Functional Test (PostgreSQL)	47s
Functional Test (SQLite)	39s
Build (windows-latest)	2m 40s
Build (ubuntu-latest)	53s
Build (macOS-latest)	43s
Check	2m 16s
Build (macOS-13)	1m 15s
Integration Test (ubuntu-latest)	35s
Integration Test (macOS-13)	1m 7s
Functional Test (MySQL)	55s
Integration Test (macOS-latest)	53s
	12m 43s

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