chore: migrate to a root project and multiple packages

[lewisjared]

Description

Moves the bookshelf package to packages/.

This makes for a more enjoyable DX with all packages installed by default and the option to use a given package.

Checklist

Please confirm that this pull request has done the following:

• [ ] Tests added
• [ ] Documentation added (where applicable)
• [ ] Changelog item added to changelog/

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.96%. Comparing base (2c52e94) to head (714584c). Report is 13 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #112 +/- ## ========================================== - Coverage 91.98% 91.96% -0.03% ========================================== Files 15 15 Lines 674 672 -2 Branches 72 72 ========================================== - Hits 620 618 -2 Misses 31 31 Partials 23 23 ```

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