Update YAML configuration and constructors to use type and overload signatures

PiperOrigin-RevId: 928757149

Author: dmitriplotnikov

cel_expr_python/BUILD

@@ -70,6 +70,7 @@ pybind_library(
         "@com_google_cel_cpp//common:function_descriptor",
         "@com_google_cel_cpp//common:kind",
         "@com_google_cel_cpp//common:minimal_descriptor_pool",
+        "@com_google_cel_cpp//common:signature",
         "@com_google_cel_cpp//common:source",
         "@com_google_cel_cpp//common:type",
         "@com_google_cel_cpp//common:type_kind",

cel_expr_python/cel.pyi

@@ -39,7 +39,7 @@ class FunctionDecl:
   def __init__(self, name: str, overloads: Sequence[Overload]) -> None: ...
 
 class Overload:
-  def __init__(self, overload_id: str, return_type: Type = ..., parameters: Sequence[Type] = ..., is_member: bool = ..., impl: Callable[..., Any] = ...) -> None: ...
+  def __init__(self, id: str | None = ..., return_type: Type = ..., parameters: Sequence[Type] = ..., is_member: bool = ..., impl: Callable[..., Any] = ..., signature: str | None = ...) -> None: ...
 
 class Type:
   BOOL: ClassVar[Type] = ...
@@ -57,7 +57,7 @@ class Type:
   TYPE: ClassVar[Type] = ...
   UINT: ClassVar[Type] = ...
   UNKNOWN: ClassVar[Type] = ...
-  def __init__(self, name: str) -> None: ...
+  def __init__(self, signature: str) -> None: ...
   @staticmethod
   def AbstractType(name: str, params: Sequence[Type] = ...) -> Type: ...
   @staticmethod