RUM feature flags

molesignalRum.addFeatureFlagEvaluation('checkout_v2', 'treatment');

LDClient.initialize(id, user, {
  inspectors: [{
    type: 'flag-used',
    name: 'molesignal',
    method: (key, detail) => molesignalRum.addFeatureFlagEvaluation(key, detail.value),
  }],
});

OpenFeature.addHooks({
  after: (context, details) => molesignalRum.addFeatureFlagEvaluation(context.flagKey, details.value),
});

feature_flags.checkout_v2 = 'treatment' AND error.type = 'TypeError'

POST /api/v1/rum/aggregate
{ "type": "views", "measures": [{ "fn": "p75", "field": "view.performance.lcp.timestamp" }], "group_by": ["feature_flags.checkout_v2"] }