Remove internal FieldValue representation

[schmidt-sebastian]

This merges the feature branch for the FieldValue removal into master. All PRs have been reviewed individually. There are no remaining TODOs from any of the PRs.

Jetpack Benchmark results (A getData() call on every document in a 1000 document QuerySnapshot): -59% runtime versus 21.4
AAR Size reduction: 10.3 Kb (-1%) (WHEEE!)
LOC reduction (excluding generated code, comments, tests): -148 lines (-1.3%) (WHEEE!)

There are no functional changes in this PR, but all Query canonical IDs change and are rewritten.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@d1a75a9). Click here to learn what that means.
The diff coverage is 76.9%.

Flag	Coverage Δ	Complexity Δ
#Encoders_FirebaseEncodersJson	100% <ø> (?)	0 <ø> (?)
#Encoders_FirebaseEncodersProcessor	100% <ø> (?)	0 <ø> (?)
#Encoders_FirebaseEncodersReflective	100% <ø> (?)	0 <ø> (?)
#FirebaseAbt	100% <ø> (?)	0 <ø> (?)
#FirebaseCommon	100% <ø> (?)	0 <ø> (?)
#FirebaseCommon_DataCollectionTests	100% <ø> (?)	0 <ø> (?)
#FirebaseCommon_Ktx	100% <ø> (?)	0 <ø> (?)
#FirebaseComponents	100% <ø> (?)	0 <ø> (?)
#FirebaseConfig	100% <ø> (?)	0 <ø> (?)
#FirebaseConfig_Ktx	100% <ø> (?)	0 <ø> (?)
#FirebaseCrashlytics	100% <ø> (?)	0 <ø> (?)
#FirebaseDatabase	100% <ø> (?)	0 <ø> (?)
#FirebaseDatabaseCollection	100% <ø> (?)	0 <ø> (?)
#FirebaseDatabase_Ktx	100% <ø> (?)	0 <ø> (?)
#FirebaseDatatransport	100% <ø> (?)	0 <ø> (?)
#FirebaseDynamicLinks	100% <ø> (?)	0 <ø> (?)
#FirebaseDynamicLinks_Ktx	100% <ø> (?)	0 <ø> (?)
#FirebaseFirestore	61.85% <76.9%> (?)	2224 <117> (?)
#FirebaseFirestore_Ktx	41.17% <ø> (?)	0 <ø> (?)
#FirebaseFunctions	100% <ø> (?)	0 <ø> (?)
#FirebaseFunctions_Ktx	100% <ø> (?)	0 <ø> (?)
#FirebaseInappmessaging	100% <ø> (?)	0 <ø> (?)
#FirebaseInappmessagingDisplay	100% <ø> (?)	0 <ø> (?)
#FirebaseInappmessagingDisplay_Ktx	100% <ø> (?)	0 <ø> (?)
#FirebaseInappmessaging_Ktx	100% <ø> (?)	0 <ø> (?)
#FirebaseInstallations	100% <ø> (?)	0 <ø> (?)
#FirebaseSegmentation	100% <ø> (?)	0 <ø> (?)
#FirebaseStorage	100% <ø> (?)	0 <ø> (?)
#FirebaseStorage_Ktx	100% <ø> (?)	0 <ø> (?)
#Tools_Errorprone	100% <ø> (?)	0 <ø> (?)
#Tools_Lint	100% <ø> (?)	0 <ø> (?)
#Transport_TransportBackendCct	100% <ø> (?)	0 <ø> (?)
#Transport_TransportRuntime	100% <ø> (?)	0 <ø> (?)

Impacted Files	Coverage Δ	Complexity Δ
...firebase/firestore/model/mutation/SetMutation.java	64% <ø> (ø)	8 <0> (?)
...le/firebase/firestore/model/mutation/Mutation.java	87.5% <ø> (ø)	9 <0> (?)
...ebase/firestore/model/mutation/DeleteMutation.java	68.42% <ø> (ø)	7 <0> (?)
...a/com/google/firebase/firestore/core/UserData.java	49.51% <ø> (ø)	0 <0> (?)
...irebase/firestore/local/SQLiteCollectionIndex.java	42.85% <ø> (ø)	1 <0> (?)
...com/google/firebase/firestore/core/IndexRange.java	83.33% <ø> (ø)	3 <0> (?)
...om/google/firebase/firestore/local/LocalStore.java	95.23% <ø> (ø)	67 <0> (?)
.../com/google/firebase/firestore/model/Document.java	85.71% <ø> (ø)	19 <0> (?)
...ebase/firestore/model/mutation/VerifyMutation.java	30.76% <ø> (ø)	2 <0> (?)
...main/java/com/google/firebase/firestore/Query.java	2.93% <0%> (ø)	4 <0> (?)
... and 25 more

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[wilhuff]

LGTM