integrate the llm and versioncontrol packages in the pullpal package
* Functionality to select a Github issue, and generate an LLM prompt
from it (PickIssue)
* Functionality to parse LLM response (from string or file), update
local git repository, and create pull request (ProcessResponse and
ProcessResponseFromFile)
* Retrieving the current state (i.e. contents) of file at path in local
repo
* Starting a commit
* Updating the contents (or creating) file at path in local repo and
updating the "started" commit
* Finishing a commit
* Pushing commit to new remote branch (as part of creating a PR)
* Removing local repository on "shutdown"
Added "version control client" interface and created a Github
implementation of it. Right now it only creates pull requests and lists
issues.
Restructued some code. Idk if it will be permanent.
Next I plan to add behavior around replacing files in the local repo,
and creating commits.
