This MR makes several major tweaks to the codebase. Primarily it adjusts
the setup steps for the application so that rather than providing just
the project ID in the `.gitlab.nvim` file, users can also provide a
vareity of other settings, such as auth_token, base_branch, and so
forth. This is to make the project more extensible in the future.
This MR also fixes a variety of issues with error handling in the code,
primarily in the request/response model between the Lua jobs and the
Golang server.
BREAKING CHANGE: Modifies `.gitlab.nvim` and setup steps
This commit changes the filter on the API response so that we are only
filtering out system level notes. This means we get notes that are not
linked to specific locations in the code.
Subsequent work will have to separate these types of notes from the
other code-linked notes and probably display them in some sort of
separate tree.
