feat: add ai_search_namespaces and ai_search binding types #27822

Job	Run time
Checks	9m 28s
Add PR to project	5s
Tests (macOS, packages-and-tools)	8m 50s
Tests (Windows, packages-and-tools)	15m 0s
Tests (Linux, fixtures)	11m 37s
Tests (Linux, packages-and-tools)	11m 0s
Tests (Windows, fixtures)	16m 25s
Tests (macOS, fixtures)	11m 8s
	1h 23m 33s

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