[webbrowser] Add register_standard_browsers (#16161)

Author: jonathandung

stdlib/webbrowser.pyi

@@ -15,6 +15,7 @@ def get(using: str | None = None) -> BaseBrowser: ...
 def open(url: str, new: int = 0, autoraise: bool = True) -> bool: ...
 def open_new(url: str) -> bool: ...
 def open_new_tab(url: str) -> bool: ...
+def register_standard_browsers() -> None: ...
 
 class BaseBrowser:
     args: list[str]