[SIP-36] deprecate tslint and configure eslint for typescript

[nytai]

CATEGORY

Choose one

• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

This PR deprecates tslint and configures eslint for typescript files. Using @airbnb/nimbus would be preferable as a long term goal, however that library is poorly documented and I had trouble getting it to work with our current setup. I left the WIP on a branch https://github.com/preset-io/incubator-superset/tree/tai/eslint-ts if anyone more familiar with integratin nimbus into existing projects would like to pick it up. For now this gets rid of tslint (and it's overly strict rules) which should make it easier to transition to typescript.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

• linting works

ADDITIONAL INFORMATION

• Has associated issue: Fixes deprecate tslint in favor of eslint w/ typescript support #8865
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

REVIEWERS

@etr2460 @suddjian @rusackas

[etr2460]

lgtm assuming CI runs and everything's still functional after the autofixes

this is amazing, it looks like this is a good first step towards modernizing our linting setup. i'm glad to be rid of tslint!

[rusackas]

[etr2460]

I'm going to merge this in then! Thanks @nytai, maybe @kristw can help you set up Nimbus in a future PR