Fix compilation of fields with name identical to their type (#294)

* Revert "Fix compilation of fields named 'bytes' or 'str' (#226)"

This reverts commit deb623ed14.

* Fix compilation of fileds with name identical to their type

* Added test for field-name identical to python type

Co-authored-by: Guy Szweigman <guysz@nvidia.com>

src/betterproto/casing.py

@@ -133,16 +133,6 @@ def lowercase_first(value: str) -> str:
     return value[0:1].lower() + value[1:]
 
 
-def is_reserved_name(value: str) -> bool:
-    if keyword.iskeyword(value):
-        return True
-
-    if value in ("bytes", "str"):
-        return True
-
-    return False
-
-
 def sanitize_name(value: str) -> str:
     # https://www.python.org/dev/peps/pep-0008/#descriptive-naming-styles
-    return f"{value}_" if is_reserved_name(value) else value
+    return f"{value}_" if keyword.iskeyword(value) else value