types(firestore): make `withConverter` retro compatible #10784

Job	Run time
Build Firestore	19m 3s
Build Firestore	19m 3s
Test Firestore Compatible	4m 37s
Test Firestore Compatible	4m 37s
Test Firestore Compatible on Firefox	6m 50s
Test Firestore Compatible on Firefox	6m 50s
Test Firestore (test:browser)	7m 58s
Test Firestore (test:browser)	8m 0s
Test Firestore (test:travis)	4m 6s
Test Firestore (test:travis)	4m 6s
Test Firestore (test:lite:browser)	1m 49s
Test Firestore (test:lite:browser)	1m 49s
Test Firestore on Firefox (test:browser)	7m 36s
Test Firestore on Firefox (test:browser)	7m 36s
Test Firestore (test:browser:prod:nameddb)	8m 12s
Test Firestore (test:browser:prod:nameddb)	7m 53s
Test Firestore on Firefox (test:travis)	4m 45s
Test Firestore on Firefox (test:travis)	4m 45s
Test Firestore (test:lite:browser:nameddb)	2m 34s
Test Firestore (test:lite:browser:nameddb)	2m 34s
Test Firestore on Firefox (test:lite:browser)	2m 9s
Test Firestore on Firefox (test:lite:browser)	2m 9s
Test Firestore on Firefox (test:browser:prod:nameddb)	7m 41s
Test Firestore on Firefox (test:browser:prod:nameddb)	7m 41s
Test Firestore on Firefox (test:lite:browser:nameddb)	1m 56s
Test Firestore on Firefox (test:lite:browser:nameddb)	1m 56s
Check all required tests results	2s
Check all required tests results	1s
	2h 38m 18s

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