material-ui: Add unique id for each field in order to allow precise css selector.

[benjaminbours]

Reasons for making this change

Well, I started to work on it after checking this issue #1738 . But at the end it is not exactly solving this, but it is allowing at least a way to have a specific selector for each rendered field using the MUI theme.

Which is really important from my point of view because it allows a more complex way to style the form.

Checklist

• [ ] I'm updating documentation
  • [ ] I've checked the rendering of the Markdown text I've added
• [X] I'm adding or updating code
  • [X] I've added and/or updated tests. I've run npm run test:update to update snapshots, if needed.
  • [ ] I've updated docs if needed
  • [X] I've updated the changelog with a description of the PR
• [ ] I'm adding a new feature
  • [ ] I've updated the playground with an example use of the feature

[benjaminbours]

@heath-freenome @epicfaace @jacqueswho

Please when you got time, have a look and let me know. I don't know who can give any validation or do any release for this project, sorry to bother you if you are not the right persons.

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