feat(storage): expose purgeCache #44

Job	Run time
Build supabase-js package	2m 37s
Deno Tests / 2.x	7m 15s
Node Integration	7m 16s
Deno Tests / 1.x	7m 0s
Unit + Type Check / Node.js 20 / OS ubuntu-latest	3m 4s
Unit + Type Check / Node.js 20 / OS windows-latest	6m 48s
Next.js Integration	6m 29s
Bun Integration	4m 15s
Expo Tests	5m 26s
Unit + Type Check / Node.js 20 / OS macos-latest	3m 13s
WebSocket Browser Tests	6m 28s
Coveralls Finished	4s
	59m 55s

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