feat(app-check): Swift Package Manager support #630

Job	Run time
ios (tests)	17m 21s
ios (tests)	17m 21s
ios (packages/cloud_firestore/cloud_firestore/example)	18m 32s
ios (packages/cloud_firestore/cloud_firestore/example)	8m 48s
	1h 2m 2s

Provide feedback