Restore Todoist nested project logic

[tcrammond]

Some useful project logic was mistakenly removed in #1197 . This re-introduces it.

The logic being re-introduced looks for the closest project in the Todoist project hierarchy that matches something in the user's Toggl workspace. This was existing behaviour that shouldn't be removed.

Resolves #1223, partially reverts #1197.

Second commit refactors the module according to eslint/prettier, and tweaks the integration to provide functions to the timer link instead of raw values (so that it can retrieve values at runtime after any changes, not only on load).

Testing points

• Lowest level project in Todoist project hierarchy, which matches an existing project in your Toggl workspace, is added to the time entry.
• Tags are added to the timer if the Todoist task has any tags or not.
• If you open a task and then change the description or the tags, the latest values will be reflected in the popup after you click the timer button.
• Extension doesn't error out if there isn't a project etc.

[leafi]

Seems to work pretty well with this Todoist integration, the project autoselect stuff :)

Didn't test tags. yarn xo doesn't even work for me, so I didn't run the linter.

Tested in Chrome.. no console errors.. LGTM 👍