Remove set generation methods from Scope

Prior to this change, we had replaced all callers with the query
equivalents. This provides a considerable performance improvement when
compiling large files, as we are no longer repeatedly creating new sets.

This change removes the unused methods which generated the sets as they
are no longer needed (and are a footgun).

src/fluent_compiler/codegen.py

@@ -116,12 +116,6 @@ def __init__(self, parent_scope=None):
         self._properties = {}
         self._assignments = {}
 
-    def names_in_use(self):
-        names = self.names
-        if self.parent_scope is not None:
-            names = names | self.parent_scope.names_in_use()
-        return names
-
     def is_name_in_use(self, name: str) -> bool:
         if name in self.names:
             return True
@@ -131,12 +125,6 @@ def is_name_in_use(self, name: str) -> bool:
 
         return self.parent_scope.is_name_in_use(name)
 
-    def function_arg_reserved_names(self):
-        names = self._function_arg_reserved_names
-        if self.parent_scope is not None:
-            names = names | self.parent_scope.function_arg_reserved_names()
-        return names
-
     def is_name_reserved_function_arg(self, name: str) -> bool:
         if name in self._function_arg_reserved_names:
             return True
@@ -146,9 +134,6 @@ def is_name_reserved_function_arg(self, name: str) -> bool:
 
         return self.parent_scope.is_name_reserved_function_arg(name)
 
-    def all_reserved_names(self):
-        return self.names_in_use() | self.function_arg_reserved_names()
-
     def is_name_reserved(self, name: str) -> bool:
         return self.is_name_in_use(name) or self.is_name_reserved_function_arg(name)