Update lint / format config

[codenem]

Update to latest eslint + add strict and stylistic rules.
Configure prettier to get it to format files in accordance to our stylistic rules (e.g. to get auto format on save)
Fix and format codebase.
New configs should be hoisted in a package

[yashhhguptaaa]

Hey @codenem, could you assign this issue to me? I’d like to work on it.

[yashhhguptaaa]

Hey @gearnode @codenem, could you please review the above PR? Let me know if there are any changes or suggestions.