threading: add gettrace and getprofile functions (#6407)

Added in https://bugs.python.org/issue42251

stdlib/threading.pyi

@@ -22,6 +22,11 @@ if sys.version_info >= (3, 8):
 
 def settrace(func: _TF) -> None: ...
 def setprofile(func: _PF | None) -> None: ...
+
+if sys.version_info >= (3, 10):
+    def gettrace() -> _TF | None: ...
+    def getprofile() -> _PF | None: ...
+
 def stack_size(size: int = ...) -> int: ...
 
 TIMEOUT_MAX: float