2722 - Add Fontpicker Component to Editor

[EdwardCoyle]

Explain the details for making this change. What existing problem does the pull request solve?
This PR adds a new Fontpicker component to IDS. The Fontpicker has been integrated into the Editor component, and takes the place of the h3 and h4 buttons that previously existed.

Related github/jira issue (required):
Closes #2722

Steps necessary to review your pull request (required):

• Pull this branch, build, run the app
• Navigate to http://localhost:4000/components/editor/example-index?theme=uplift
• inspect the fontpicker and ensure it works correctly when placing a standard caret in different editor blocks. Also check that it works with text selected (note that this only does top-level block formatting, similar to the buttons' functionality).
• Navigate http://localhost:4000/components/editor/example-complex-fontpicker?theme=uplift
• double check that all header types and blockquotes work correctly.
• Do a general smoke test of all Editor configurations: http://localhost:4000/components/editor/list
• Check the standalone Fontpicker example at http://localhost:4000/components/fontpicker/example-index.html, and make sure a toast appears when a new Font Style is chosen.

There are also a handful of new functional tests for this component that should all pass.

Included in this Pull Request:

• An e2e or functional test for the bug or feature.
• A note to the change log.

[EdwardCoyle]

@Fruko if you're able, would you mind testing this in your environment to see if it meets your requirements?

[Fruko]

@EdwardCoyle sure, the branch or after it's merged to master?

[tmcconechy]

@Fruko Either way. But if you do try the branch and find some suggestions we can get them in sooner before merged. But either will help.

[tmcconechy]

• should we move the arrow closer? or is that the design?

- should this one have an arrow?

[EdwardCoyle]

The design put some extra space between the text and the arrow.

I'm not sure why the in-page one doesn't have the arrow... I can look into it

[Fruko]

Sorry for the delay, the changes are good for our use case. Thanks!