Deprecate IDisposable and related utilities

[wgoehrig]

Since TypeScript 5.2 added support for the explicit resource management feature in ECMAScript, let's deprecate IDisposable and use the new built-in Disposable instead.

[pmconne]

I want to see what output the linter produces. You've presumably introduced a ton of deprecation warnings.

I'd remove all the implements IDisposables from our code - they all implicitly implement it and you'd otherwise presumably have to suppress the lint rule at each occurrence.

[wgoehrig]

This is actually passing lint without any errors in its current state - looks like the @typescript-eslint/no-deprecated rule just doesn't check implements clauses...

[pmconne]

I'd remove implements IDisposable everywhere anyway, no reason to document implementation of an interface we discourage people from using.