Make autocompetion language agnostic

[mdboom]

This is a follow on to #2535 that makes autocomplete work on any language with a language definition.

The primary change (beyond the obvious) is to send the entire code chunk up to the cursor across the wire to the eval frame and doing any language-specific parsing of it on that side. This is more language generic, since language plugins can't run code on the editor side.

To work with Python, will also require pyodide/pyodide#584 to be merged and released.

Pull Request checklist

• Documentation: If this feature has or requires documentation, the relevant docs have been updated.
• Changelog: This PR updates the changelog with any user-visible changes.
• Tests: This PR includes thorough tests or an explanation of why it does not

[codecov]

Codecov Report

Merging #2539 into autocomplete will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           autocomplete    #2539   +/-   ##
=============================================
  Coverage         71.17%   71.17%           
=============================================
  Files               239      239           
  Lines              5859     5859           
  Branches            937      937           
=============================================
  Hits               4170     4170           
  Misses             1670     1670           
  Partials             19       19

Impacted Files	Coverage Δ
src/editor/state-schemas/state-schema.js	87.5% <ø> (ø)	⬆️
src/editor/state-schemas/language-definitions.js	83.33% <ø> (ø)	⬆️
src/eval-frame/parse-js-completion-scope.js	100% <ø> (ø)

[bcolloran]

wow that was fast, i thought i'd handle the generalization once you took care of the pyodide side... this is great! :-D

expanded on the doc string a bit, other than that it all looks good!

[bcolloran]

spotted one more small thing

[bcolloran]

code looks good @mdboom, thanks! one last thought: add a note in the changelog?

have not tested this with pyodide of course, since that will depend on your deploy schedule, but merge this as soon as you wish! (and ping the channel when the relevant pyodide updates deploy! i'm excited about this one!)