feat(perf): Swift Package Manager support #631

Job	Run time
web (tests)	3m 28s
web (tests)	3m 28s
web-app-check	15m 16s
web-app-check	2m 57s
web (packages/cloud_firestore/cloud_firestore/example)	5m 13s
web (packages/cloud_firestore/cloud_firestore/example)	5m 13s
web-wasm (tests)	3m 59s
web-wasm (tests)	3m 59s
web-wasm (packages/cloud_firestore/cloud_firestore/example)	4m 21s
web-wasm (packages/cloud_firestore/cloud_firestore/example)	4m 21s
	52m 15s

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