deno: init at 1.0.0

Adding deno for it's 1.0.0 release

* Builds from source (doesn't build V8 from source)
* Runs most of the tests
* Bundles completions for:
  * bash - tested
  * zsh  - untested
  * fish - untested
* Set up for multiple builds:
  * x86_64-linux
    * Passed - NixOS
  * aarch64-linux
    * Passed just build - Raspbian on RPI4
    * Failed build + check (ended with SIGKILL 9)
  * x86_64-darwin
    * Untested