Update Framework from Jetpack.

Changes included:
* 1fc8203: Add getAll() API to AppSearchBatchResult as recommended by API council
* aa94928: Updates to Query Documentation
* 63badf5: Create flavours of all Session tests to run against both backends.
* 03e917e: Move the decision to optimize out of AppSearchImpl.
* 4909a2f: Make AppSearchImpl closeable.
* 3ebce41: Fix and enforce MixedMutabilityReturnType errorprone warnings
* 6994b7e: Update documentation for GetByUri
* 4f632ca: Preinitialize map to proper size.
* efeb70b: Update documentation for RemoveByUriRequest
* daecb8a: Refactor SetSchemaResponse to merge SetSchemaResult
* 2682de4: SetSchemaResponse will be only returned in successful case.
* f0f0ec4: Update documentation for GenericDocument

Bug: 178060626
Bug: 179416188
Bug: 175763859
Bug: 175801531
Bug: 162450968
Bug: 179407490
Bug: 171758893
Test: Presubmit
Change-Id: I3937e877a84b6255a5ca0fd343a3de28ebaea174