Update CodeMiror Julia support

[savq]

These are the pending tasks to update the CodeMiror Julia thingies:

Dependencies

Merge PRs and release new versions.

• [ ] JuliaPluto/lezer-julia#7
• [ ] JuliaPluto/lang-julia#3
• [ ] JuliaPluto/codemirror-pluto-setup#15

Here

Refactor frontend/components/CellInput/ modules that depend on lezer stuff.

• [ ] block_matcher_plugin.js
  • Works surprisingly well...
• [ ] pkg_bubble_plugin.js
  • This can probably be simplified with ImportPath
• [ ] debug_syntax_plugin.js
• [ ] scopestate_statefield.js
• [ ] lezer_template.js