[Feature]: Warning annotations

[agg23]

Tracking issue for the warning annotation feature.

Suggested Warnings

• Floating promises - examine ESLint solutions
• Async describes
• Event handlers that are still attached + running (locator handler, route, async events)

See #34845, #34861, #34957, #35374, #35373

[agg23]

Possibly implement #34807 and #35049 as warnings.

[agg23]

Prototyped a TypeScript based, no dependency linter which could take existing linter rules like no-floating-promises without changes and run them in a very minimal harness. We decided this wasn't worth integrating.