add several node:zlib classes

[anonrig]

Lacks tests but before adding more, I think this is getting ready to have an additional pair of eyes.

Remaining todo:

• Add tests
• Investigate why eslint is causing so much trouble (hence eslint-ignore)

[jasnell]

Looks good once we're sure the internal CI is green.

[mikea]

appreciate the effort to make all .ts code typed.

[npaun]

Tests are failing under ASan. I'm worried there might be some kind of corruption.

[npaun]

Do we know why the unnecessary mutex guard caused the test failure?

It doesn't immediately jump out at me what this has to do with a mutex
Fatal uncaught kj::Exception: workerd/api/node/zlib-util.c++:311: failed: expected status == 0 || status == (-3); jsg.Error: Uncaught error on closing zlib stream

[anonrig]

Do we know why the unnecessary mutex guard caused the test failure?

Yes, the class destructor was checking the reference not the value, and causing the sanitizer to fail.

[npaun]

Aside: That implicit conversion to operator T* in libkj is kind of wack.