refactor(flags): return FeatureFlagInfo in --python_version flag #2167
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Make the
--python_version
flag also return theFeatureFlagInfo
provider.There are two reasons to also return the FeatureFlagInfo provider:
First, it allows the flag implementation to change the value and have that value respected
by config_setting() later. This allows, for example, the rule to use custom logic (and
information from things it depends on) to determine the effective flag value.
Secondly, it makes the flag compatible with the Google fork of this rule, which is
implemented using FeatureFlagInfo, to help eventually converge them.
Along the way, add config_common to the Sphinx Bazel inventory.