add testing for wasm

[Mythra]

fixes #37

add testing in CI for wasm targets. Testing in WASM is a bit weird right now, since you need a wasm environment to actually run in. Also no wasm testing solutions support doctests (and even if they did most of the doctests in color-eyre depend on doing something like reading to STDOUT/STDIN, which most WASM ABIs don't have AFAIK).

As such the following has been done here:

• Utilize a JS WASM environment tooling: wasm-pack && wasm-bindgen-test.
• Create a test target they can "see" , adding a test folder, and using: #[wasm_bindgen_test].
  • Have that test validate the bare minimum functionality: installing, printing out an error.
• Run those tests using NodeJS so we don't have to worry about any browser weirdness.

Hopefully the approach is okay? WASM made it a bit awkward, but I figured may as well start off the PR with what works. Ideally once tracing has added in wasm test support, we can also validate the tracing bit of functionality with another #[wasm_bindgen_test], I figured we shouldn't add that before incase they accidentally break it somehow without meaning to because they aren't testing it.

[Mythra]

Hmm not sure what to do about that clippy warning, as locally I don't seem to receive it (also I didn't touch that file):

$ cargo clippy -- -D warnings
    Finished dev [unoptimized + debuginfo] target(s) in 0.03s
$ echo $?
0

Will try looking into it, but unsure.

[yaahc]

Yea, that clippy warning is very odd. I don't think its from your change though so don't worry too much about figuring it out.

Let me change the CI settings so clippy isn't required for merge.

[Mythra]

Thanks! I also think the "two expected" that aren't reporting are as a result of me changing the matrix so the job name changed? It's weird they don't have a "details" link.

[yaahc]

I think it might be because I still had the jobs with those names as required jobs in CI, I changed that and am restarting CI, lets see if it works!

[yaahc]

I'm gonna leave this open for now because I don't have any other changes for color-eyre planned short term so there wont be any missed testing. I'll try to figure out the clippy issue. This is already good to go as far as I can tell though, so I'll merge this as soon as I need it or once the clippy thing is fixed. Thanks again for setting this up!

[Mythra]

No problem at all, thanks for your review and the help!