Remove Enum prefixes (#187)

Co-authored-by: nat <n@natn.me>
Co-authored-by: Tim Schmidt <w4rum@users.noreply.github.com>
Co-authored-by: Arun Babu Neelicattu <arun.neelicattu@gmail.com>

src/betterproto/compile/naming.py

@@ -11,3 +11,11 @@ def pythonize_field_name(name: str) -> str:
 
 def pythonize_method_name(name: str) -> str:
     return casing.safe_snake_case(name)
+
+
+def pythonize_enum_member_name(name: str, enum_name: str) -> str:
+    enum_name = casing.snake_case(enum_name).upper()
+    find = name.find(enum_name)
+    if find != -1:
+        name = name[find + len(enum_name) :].strip("_")
+    return casing.sanitize_name(name)