lfs: optimize path filtering #355
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I've optimized LFS path filtering as we discussed in #338. The first optimization implements the suggestion in #338 (comment) to short-cut a single-path
includefilter. Here are the tests for the regex that extracts the path prefix: https://regex101.com/r/wBjHf0/1 Note that the extra\non regex101.com is only necessary to allow one test case per line, it isn't needed in the actual regex.The second optimization unionizes the filename regex patterns derived from Unix filename patterns and matches each path against the pre-compiled single regex, which is faster than matching against the Unix filename patterns individually. Also, it avoids intermediate list materialization but instead implements a streaming filter.As the two commits implement independent optimizations, I intend this PR to be rebase-merged without commit squashing.Partially fixes #338.