The idl framework must generate feature flags of separate types depending on the value of the shouldBeFCVGated parameter:

• shouldBeFCVGated==true - the associated feature flag is FCV dependent and therefore should use FeatureFlagFCVGated type.
• shouldBeFCVGated==false - the feature flag is not FCV dependent and should utilize the FeatureFlagBinaryCompatible type.

Relatedly, distinct C++ classes must be introduced to represent those feature flags.
Therefore, separate classes based on the current implementation of the FeatureFlag type should be added, while preserving the exact same behaviour for both FeatureFlagFCVGated and FeatureFlagBinaryCompatible.
As a result, the underlying types will be swapped out, but the API will remain unchanged.