Fix and improve ESlint config

[medikoo]

It's about basic fixes and improvements (as otherwise bigger refactor into serverless projects common config is pending)

• Fix parsing option, with so far setting ESLint treated our modules as ESM, and disallowed certain syntax which is perfectly valid in CJS
• Fix configuration of strict rule, so it correctly enforces usage of 'use strict' (having that, fixed few modules in which it was missing)
• Turn on prefer-rest-aparams rule (and fixed few modules which didn't obey)
• Configure import/no-extraneous-dependencies rules, so it works for us.

Is this ready for review?: YES
Is it a breaking change?: NO

[pmuens]

LGTM