[#3] Added generate proto script create container method

Signed-off-by: Ilyas Niyazov <i.niyazov@yadro.com>

frostfs_sdk/models/enums/selector_clause.py

@@ -1,26 +1,14 @@
-class SelectorClause:
-    """
-    Enum for selector clauses with integer value mapping
-    """
+from enum import Enum, unique
+
+@unique
+class SelectorClause(Enum):
     CLAUSE_UNSPECIFIED = 0
     SAME = 1
     DISTINCT = 2
 
-    _value_map = {
-        0: CLAUSE_UNSPECIFIED,
-        1: SAME,
-        2: DISTINCT
-    }
-
     @classmethod
-    def get(cls, value: int) -> 'SelectorClause':
-        """
-        Get enum instance by integer value
-        
-        Args:
-            value: Integer value of the clause
-            
-        Returns:
-            Corresponding SelectorClause instance
-        """
-        return cls._value_map.get(value)
+    def get(cls, value: int):
+        try:
+            return cls(value)
+        except ValueError:
+            raise KeyError(f"Unknown enum value: {value}")