📦 [RUMF-1162] update developer-extension

[BenoitZugmeyer]

Motivation

Keep dependencies up to date and maintanable

Changes

• Replace bumbag with mantine.
  • Reasons:
    • Bumbag still ships with a fixed and outdated version of lodash. This version is known to have a vulnerability, but the bumbag team doesn't seem to be motivated to change that. Overriding the dependency version with yarn works, but is combursome.
    • Bumbag typings are incompatible with strictNullChecks, so the whole extension codebase lacks stricter types.
    • Bumbag did release a major version, and by upgrading it, we would need to make a pass on all usages anyway
  • Why mantine:
    • Very similar to bumbag (uses same dependencies (emotion), provides the same components), so upgrade is easy
    • Lots more traction (6.5k stars on github, vs 971 for bumbag)
• Adjust the extension codebase to comply with stryctNullChecks
• Update react and types

The webpack plugins used by the extension has not been updated. This will be done in a future task where we update webpack.

Testing

• Local
• Staging
• Unit
• End to end

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I have gone over the contributing documentation.