Add exhaustive/extensive tests

[tgross35]

Builds on top of #348 so it includes those commits.

[tgross35]

A start at "extensive" tests that run up to u32::MAX inputs, only on requested functions. Requested tests are set via env with a few different options:

# Run one or more exhaustive test
LIBM_EXTENSIVE_TESTS=sinf,cosf cargo t --features test-multiprecision --release -- extensive
# Run all `f32` or `f64` tests
LIBM_EXTENSIVE_TESTS=all_f32 cargo t --features test-multiprecision --release -- extensive
# Run everything
LIBM_EXTENSIVE_TESTS=all cargo t --features test-multiprecision --release -- extensive

For single-arg f32 it tests with all possible values in the domain. For f64, it runs u32::MAX tests with a logspace. For functions with N > 1 arguments, it currently does a logspace for each arg, each with u32::MAX^(1/N) steps.

I ran a handful of tests on my 24-core machine, the current setup with Rayon ranges about 10m-1h depending on the test. That can probably be improved, I haven't looked at this from a perf perspective at all (though one thing I noticed quickly from htop is there is a lot of time spent in kthreads, maybe I need to double check if Rayon is doing batching).

After I get this a bit better sorted out, I am going to hook up CI to run relevant tests when source files change. Current state is very scratchy.

@beetrees you may be interested since I know you suggested this a few times.

[tgross35]

I'm using the mimic harness so I can skip tests at runtime and show a progress bar, sample output.

running 90 tests
test mp_extensive_acos       ... ignored, extensive tests are only run if specified in RUST_LIBM_EXTENSIVE
test mp_extensive_acosf      ... starting extensive tests for `acosf`
[9m  100%] #################### acosf 4,294,967,295/4,294,967,295: 7,672,836.6102/s eta 0s
ok
test mp_extensive_acosh      ... ignored, extensive tests are only run if specified in RUST_LIBM_EXTENSIVE
test mp_extensive_acoshf     ... starting extensive tests for `acoshf`
[5m  73 %] ###############----- acoshf 3,139,620,000/4,294,967,295: 3,544,521.3401/s eta 5m (1.6715916e36,)

[tgross35]

(though one thing I noticed quickly from htop is there is a lot of time spent in kthreads, maybe I need to double check if Rayon is doing batching)

Way faster with chunking, acosf (sample test with a small domain) completes in two minutes on my machine, asinhf (sample with an unbounded domain) completes in 5 minutes.