As I suggested from nirum-lang/nirum-python#34 (comment), now generated Python classes have __nirum_type__ attribute which contains one of 'unboxed'/'enum'/'record'/'union'/'service'. The future versions of Python runtime library would be able to utilize this rather than diagnostics using isinstance()/hasattr() queries. See also examples on test_nirum_type().
Also as I suggested from the same comment above, now union classes have an immutable map named __nirum_tags__ that keys are tags and values are class objects. See also examples on test_nirum_tag_classes().
Since the bug #185 was also applicable to union tag enums, also fixed it. See also test_union_reserved_keyword_for_tag() to reproduce the bug.
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