feat(devtools): add support for custom test-id attributes

[delca85]

What:

I added a settings modal to chrome extension with the aim of setting a custom testId attribute to be used by queries in chrome extension.

Why:

An issue was opened by a testing-playground user (#213).

How:

1. install and use reach dialog
2. add a Dialog in MenuBar.js containing an input that receives the custom testId by the user
3. when the user clicks the Dialog ok button a message of type SET_CUSTOM_TEST_ID is sent to contentScript
4. content-script launch the new configure function on parser that calls configure by testing-library setting the custom attribute as new test id attribute

Checklist:

• Tests
• Ready to be merged
  

The modal is totally not styled, since the logic I developed is hopefully to be merged with the #226 by @smeijer .

I am linking a video to show how it works right now.

[smeijer]

Thanks, @delca85! Awesome work.

I'm going to merge it as is and will update the UI in a follow-up PR.