Apply association rule mining on SVN metadata to extract the cluster of methods that were frequently changed together in the past

- [ ] Download SVN commits and store them locally in the plugin
- [ ] Extract the gold set methods from the downloaded SVN commits
- [ ] Apply association rule mining on SVN metadata to extract the cluster of methods that were frequently changed together in the past

No files, tests, or entry points are named. Start by reviewing the three listed steps: local SVN commit storage, gold-set method extraction, and association rule mining over the metadata. Done means the plugin completes all three steps and produces the requested cluster of frequently co-changed methods.

Written by the indexing model from the issue text.