Add TinyGo to GitHub Actions CI

[bradleypeabody]

To get things working well with TinyGo we should:

• Get it re-enabled in the wasm-test-suite (currently this seems to run without even trying to use TinyGo)
• Add the appropriate TinyGo compiler installation step(s) to the Github Actions config, so it at least as the compiler and attempts to run things.
• Review these two items and see how they fit in: https://github.com/vugu/vugu/issues/204 https://github.com/vugu/vugu/pull/209
• See if there is anything else left to get it working well in the pipeline and usable for developers.

[owenwaller]

I don't think we should focus on TinyGo support for v1.0. This seems like a post v1.0 enhancement.