Block: Switch

[ahdinosaur]

Describe the solution you'd like

Example:

switch
case os.name == "macos"
then "brew"
case os.name == "linux" && os.distribution == "debian"
then "apt"

Is not super important since nested if-then-else if-then-else if-then works too.

TODO Checklist

• Add to rimu-parse
  • Add unit test(s)
• Add to rimu-eval
  • Add unit test(s)
• Add spec tests
  • Use related JSON-e spec tests to start
• Add to examples
  • Add example to playground
• Add to docs
  • Check complete on roadmap

Describe alternatives you've considered

• JSON-e switch: https://json-e.js.org/operators.html#switch

Additional context