Create typing hints for IUIAutomationTextRange (#13903)
Objects from comInterfaces generally do not have helpful type hints.
Description of user facing changes
When a variable is type hinted with IUIAutomationTextRangeT supported functions will appear as type hints.
Description of development approach
Implements methods found in https://docs.microsoft.com/en-us/windows/win32/api/uiautomationclient/nn-uiautomationclient-iuiautomationtextrange, checked against usages in NVDA code.
