Bootstrap project and add initial annotation components

[acelaya]

Part of hypothesis/h#9548

Initialize the library with components to compose annotation-related cards and UIs, that will be used for hypothesis/client#7140 and hypothesis/h#9618.

Tip

The code inside src has been extracted from hypothesis/client#7140 verbatim.

The rest of the configuration files are based on the approach we usually follow in other similar projects, with one exception:

A stylesheet which imports tailwind styles used only for the tests. When more documentation is added we can extract that stylesheet to be reused there, as we do in frontend-shared.

This PR does not include a documentation or a sandbox for local development like we have in https://github.com/hypothesis/frontend-shared. That will be added in a follow-up PR.

Todo

• Investigate one failing test
• Add GitHub actions configuration
• Add Makefile

[robertknight]

There are a few project name references that need updating. Otherwise this looks good. I didn't review the changes under src/ since those are copied from the client repository.