Use better types for time.get_clock_info (#7040)

stdlib/time.pyi

@@ -1,8 +1,7 @@
 import sys
 from _typeshed import structseq
-from types import SimpleNamespace
-from typing import Any, Union
-from typing_extensions import final
+from typing import Any, Protocol, Union
+from typing_extensions import Literal, final
 
 _TimeTuple = tuple[int, int, int, int, int, int, int, int, int]
 
@@ -80,7 +79,13 @@ def time() -> float: ...
 if sys.platform != "win32":
     def tzset() -> None: ...  # Unix only
 
-def get_clock_info(name: str) -> SimpleNamespace: ...
+class _ClockInfo(Protocol):
+    adjustable: bool
+    implementation: str
+    monotonic: bool
+    resolution: float
+
+def get_clock_info(name: Literal["monotonic", "perf_counter", "process_time", "time", "thread_time"]) -> _ClockInfo: ...
 def monotonic() -> float: ...
 def perf_counter() -> float: ...
 def process_time() -> float: ...