🎨 add persistent property to trait

persistent drives if the trait should be integrated or not. Difference between Persistent trait and persistent attribute is that the trait drives the lifecycle of the representation but the attribute drives lifecycle of trait.

client/ayon_core/pipeline/traits/trait.py

@@ -10,6 +10,7 @@ from pydantic import (
     AliasGenerator,
     BaseModel,
     ConfigDict,
+    Field,
 )
 
 if TYPE_CHECKING:
@@ -32,6 +33,10 @@ class TraitBase(ABC, BaseModel):
         )
     )
 
+    persitent: bool = Field(
+        default=True, title="Persitent",
+        description="Whether the trait is persistent (integrated) or not.")
+
     @property
     @abstractmethod
     def id(self) -> str: