Deprecate isLowResolution when get snapshot from cache.(1/N)

Allows to get either kind of resolution snapshot from cache.
For some use case there just need to query the data of snapshot without
drawing it. To support this, introduce TaskSnapshotManager, which will
replace several task snapshot related APIs in ATMS.

Flag: com.android.window.flags.reduce_task_snapshot_memory_usage
Bug: 238206323
Test: presubmit, no logic change.
Change-Id: I3c47305881a961de45fe0d5b74078cf9e9dd312c