Add option to ignore commits with more than n changed files

There might be commits with a large number of files in them (changed naming convention or project restructure for example). It would be nice to have an option to ignore a commit that has more than n changed files to filter them out.

Start by locating the command-line option parsing and the code that processes commits and counts their changed files. Add the requested threshold behavior so commits exceeding n changed files are excluded, then verify that normal commits remain included and run the repository's existing tests or command checks.

Written by the indexing model from the issue text.