feat: add eslint & eslint-plugin-compat

[andrewdoro]

Description of the change

This PR adds eslint configuration for fixing browser compatibility errors.
However this doesn't detect array methods such as toSorted #53 amilajack/eslint-plugin-compat#258 (comment). I've also tried to add https://github.com/azu/eslint-plugin-typescript-compat for detecting the methods. But no luck. 😩

• Add eslint config for the project
• Add eslint-plugin-compat for browser compatibilities
• Add to package.json

 "browserslist": [
    "chrome 64",
    "edge 79",
    "firefox 67",
    "opera 51",
    "safari 12"
  ]

I've disabled the recommended rules as there quite a lot of error and we can tackle them in another PR.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation or Development tools (readme, specs, tests, code formatting)

Links

#52

Checklists

Development

• Prettier was run (if applicable)
• The behaviour changes in the pull request are covered by specs
• All tests related to the changed code pass in development

Paperwork

• This pull request has a descriptive title and information useful to a reviewer
• This pull request has a Jira number
• This pull request has a Process.st launch checklist

Code review

• Changes have been reviewed by at least one other engineer
• Security impacts of this change have been considered

[loganvolkers]

We should make sure this is run with other tests and GitHub actions (see note on package.json)

[loganvolkers]

Looks good to me