Add flag_values attribute to config_setting. This gives the ability to select on config_feature_flags. They still have not been publicly documented, because there's no way to set them. But, progress. config_setting still needs to have either values or flag_values; it cannot have both be empty. However, values is no longer mandatory, nor must it be nonempty (as long as flag_values is set nonempty). RELNOTES: None. PiperOrigin-RevId: 152515036
{Fast, Correct} - Choose two
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