Remove libstatsmetadata

Remove kWhitelistedAtoms usage in MetricsManager and remove:
- atoms_info references from statsd
- libstatsmetadata usages from statsd
- libstatsmetadata library
- atoms_info_writer.h/.cpp
- references to atoms_info in rest of stats-log-api-gen
- allow_from_any_uid annotation

Fixes: 147600720
Fixes: 154856835
Fixes: 148993016

Test: m stats-log-api-gen
Test: m stats-log-api-gen-test &&
out/host/linux-x86/nativetest/stats-log-api-gen-test/stats-log-api-gen-test
Test: m statsd

Change-Id: I2e0579609ff257da934b95cdda397f3ca0ffa1f0