feat: introduce skip_lib_check attribute

[thesayyn]

closes #326

Benchmark 1: bazel build examples/skip_lib_check/unspecified
  Time (abs ≡):         1.734 s               [User: 0.051 s, System: 0.060 s]
 
Benchmark 2: bazel build examples/skip_lib_check/on
  Time (abs ≡):        737.8 ms               [User: 59.2 ms, System: 50.6 ms]
 
Benchmark 3: bazel build examples/skip_lib_check/off
  Time (abs ≡):         1.180 s               [User: 0.049 s, System: 0.045 s]
 
Summary
  'bazel build examples/skip_lib_check/on' ran
    1.60 times faster than 'bazel build examples/skip_lib_check/off'
    2.35 times faster than 'bazel build examples/skip_lib_check/unspecified'

[gregmagolan]

So simple for such a large perf improvement 🚀

[alexeagle]

I think this is a mistake, it makes tsc green under Bazel but red outside of Bazel in many cases. skipLibCheck is a well-understood performance tradeoff and there's lots of docs out there about adding it to tsconfig. We have never overridden tsconfig in this way before and I'd rather not start. I'll make a PR to improve this before the next release.