optimize recursive glob matching (globstar) in simple cases

[sekiguchi-nagisa]

in simple case (not contains . and .., only follow single path element by double star), iterate whole child directories and match these paths with glob pattern
(in naive globstar implementation, recursively call normal glob function, so opendir is called N^2 times of path depth)

see python/cpython#102613

[sekiguchi-nagisa]

optimized recursive glob matching can be implemented like the following
see (https://www.codeproject.com/Articles/5163931/Fast-String-Matching-with-Wildcards-Globs-and-Giti)

[sekiguchi-nagisa]

should optimize the following pattern

echo **/**/*.png