AnnotatedString support

[edenman]

Seeing as Jetpack Compose is the new hotness, it would be great to have support for building AnnotatedStrings. Options:

0. Yolo, add the Compose dependency and people can manually remove it if they care.
1. Fork
2. Do the okio/etc thing and change the artifact id to phrase2 and include Compose in that artifact. If somehow there are bugs that need to get fixed, in theory we can do a release of both artifacts
3. Separate phrase-compose artifact, make keys/keysToValues public, and add a method in the new artifact that reads them and builds an AnnotatedString

[edenman]

Looks like https://github.com/cashapp/paraphrase is the new hotness