ref(flags): underscore featureflags module and identifier

Author: aliu39

sentry_sdk/integrations/featureflags.py renamed to sentry_sdk/integrations/feature_flags.py

@@ -16,7 +16,7 @@ class FeatureFlagsIntegration(Integration):
     @example
     ```
     import sentry_sdk
-    from sentry_sdk.integrations.featureflags import FeatureFlagsIntegration, add_feature_flag
+    from sentry_sdk.integrations.feature_flags import FeatureFlagsIntegration, add_feature_flag
 
     sentry_sdk.init(dsn="my_dsn", integrations=[FeatureFlagsIntegration()]);
 
@@ -25,7 +25,7 @@ class FeatureFlagsIntegration(Integration):
     ```
     """
 
-    identifier = "featureflags"
+    identifier = "feature_flags"
 
     @staticmethod
     def setup_once():

tests/integrations/featureflags/__init__.py renamed to tests/integrations/feature_flags/__init__.py

@@ -4,7 +4,7 @@
 import pytest
 
 import sentry_sdk
-from sentry_sdk.integrations.featureflags import (
+from sentry_sdk.integrations.feature_flags import (
     FeatureFlagsIntegration,
     add_feature_flag,
 )