Add FieldsFilter to EventMetric Also, remove references to FieldFilter.include_all. If the FieldFilter is not set or if FieldFilter.fields is not set then no filtering is done. Support for denylist in FieldsFilter will be added in a follow-up. Bug: 376872102 Test: statsd_test Change-Id: I588a429e18bbce941f37792e0bc38fee859e3c68