Add prim::EnumName and prim::EnumValue ops (#41965)
Summary:
[2/N] Implement Enum JIT support
Add prim::EnumName and prim::EnumValue and their lowerings to support getting `name` and `value` attribute of Python enums.
Supported:
Enum-typed function targuments
using Enum type and comparing them
Support getting name/value attrs of enums
TODO:
Add PyThon sugared value for Enum
Support Enum-typed return values
Support enum values of different types in same Enum class
Support serialization and deserialization
Pull Request resolved: https://github.com/pytorch/pytorch/pull/41965
Reviewed By: eellison
Differential Revision: D22714446
Pulled By: gmagogsfm
fbshipit-source-id: db8c4e26b657e7782dbfc2b58a141add1263f76e
