rhg: support rhg files [FILE] This comes mostly for free after the rhg status [FILE] implementation.

rhg: support "status FILE" This change adds a new [file] argument to rhg status, parses them as patterns, canonicalizes the paths, and constructs a new PatternMatcher to intersect with the existing matcher being passed to the status implementation. We also make filepatterns a public module so we can access the pattern-parsing functionality we need from commands/status.rs.

rust-matchers: add PatternMatcher This should match the behavior of the Python patternmatcher. We need this for status [FILES] support.

rust-status: only visit parts of the tree requested by the matcher This is an optimization that the matcher is designed to support, but we weren't doing it until now. This is primarily relevant for supporting "hg status [FILES]", where this optimization is crucial for getting good performance (without this optimization, that command will still scan the entire tree, and just filter it down after the fact). When this optimization fires we have to return false from traverse_fs_directory_and_dirstate, representing that that part of the tree *might* have new files which we didn't see because we skipped parts of it. This only affects the cached result of the status, and is necessary to make future status operations (which might use a different matcher) work properly.

rust-status: error on non-existent files in file_set file_set here consists of the files that were explicitly specified on the command line. Erroring on them matches the behavior of Python status.

rust-status: explicitly track bad file types Before this, we silently skipped bad file types. Now, we check to see if a path is an exact_match in our matcher, and if so, print an error for it, and only then do we skip it. A path will be an exact match when it's specified as an explicit command line argument, and this error-printing behavior is necessary for compatibility with Python status.

rust: de-hardcode glob_suffix We're adding patternmatcher in a subsequent commit, and this needs needs to be different for includematcher and patternmatcher.

rust: improve the type on DirsMultiset::from_manifest It could only return an HgPathError, but we didn't express this in the type, so we needed some unreachable!()s. Now that is expressed in the type.