React-focus-lock should be a peer dependency

[frankieyan]

🐛 Bug report

Current behavior

It's possible for a consuming app to also have React Focus Lock installed, and if the version used in Reactist can't be deduped by npm/yarn, multiple versions can end up being bundled into the app, resulting in the two fighting for focus: https://github.com/theKashey/react-focus-lock#warning

Instead, declare it as a peer dependency so that npm/yarn can properly warn users if there is a mismatch.

Steps to reproduce the bug

Discovered while testing https://github.com/Doist/twist-web/pull/5071. If Twist is using v2.5.2, and 2.9.1 is installed with Reactist, some tests will fail.

Possible solutions

Declare React Focus Lock as a peer dependency

Environment

• @doist/reactist version: v15.0.0