Speed up pattern parsing in pathlib.Path.glob()

pathlib.Path.glob() converts a given string pattern to a Path object:

Lines 644 to 645 in dcae5cd

    
           if not isinstance(pattern, PurePath): 
        
               pattern = self.with_segments(pattern)

Which has the following drawbacks:

It instantiates a Path object, which is slow
It normalizes a Windows UNC drive if given, which is unnecessary - any anchor causes NotImplementedError to be raised.
It strips the trailing slash from the pattern, so we need to peek at pattern._raw_path to restore it

It would be better to add a variant of PurePath._parse_path() for dealing specifically with glob patterns.

pythonGH-126363: Speed up pattern parsing in `pathlib.Path.glob()`

GH-126363: Speed up pattern parsing in `pathlib.Path.glob()` (#126364)

pythonGH-126363: Speed up pattern parsing in `pathlib.Path.glob()` (p…

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	if not isinstance(pattern, PurePath):
	pattern = self.with_segments(pattern)