switch to current build system and initial react packages

[briangann]

• [x] using yarn v4 as a test (not supported by create-plugin)

• [x] switch to standard build system

• [ ] conversion from KBN to new methods (see doc: )

• [ ] Convert to React

  • [ ] Convert angular config to React equivalent
  • [ ] Convert from angular ctrl to React

• [ ] Update screenshots

• [ ] Update docs

[briangann]

(this won't be merged, keeping for reference)