WIP: Golang support

[olso]

Associated Issue: #408

Did a little Go article/project, might as well add it here ⚡️

https://medium.com/@martinolsansky/webassembly-with-golang-is-fun-b243c0e34f02

Here's the contributing guide at https://github.com/wasdk/WebAssemblyStudio/wiki/Contributing

Summary of Changes

• https://github.com/olso/go-heroku-slug
• change 2

Test Plan

Tell us a little a bit about how you tested your patch.

Example test plan:

• [ ] Create Go "hello, world" project
• [ ] Click Build button
• [ ] Click Run button, and observe the Result panel
• [ ] Clicking the "x" on the Result panel closes it

Screenshots/Videos (OPTIONAL)

[ptmt]

@olso Nice work! Are you interested in finishing this?

[olso]

@ptmt Yes!!!