Plot init muts vs lev distance

Plot the number of initial mutations vs the levinshtein distance between the original and final AST.
Would need a good way to mark if AST doesn't converge.

No files, tests, or entry points are identified in the issue. First inspect the repository to find where initial mutations, original and final ASTs, and convergence are represented, then determine how plotting is currently handled. Done means producing the requested mutation-versus-Levenshtein-distance plot with a clear indication for ASTs that do not converge.

Written by the indexing model from the issue text.