Add eslint config to protect against uncaught exceptions

[juliankrispel]

Context

Unhandled exceptions can be harmful for web-apps

Acceptance Criteria

• [ ] Add no-floating-promises to eslint config

[mculp]

You just talking about in CI? Or do you want to add it as a git hook for contributors (which can be opted out of)?

[mculp]

I like this project for hooks https://github.com/evilmartians/lefthook