Move the base CodeMirror KCL support to a local package (#4897)

* Move CodeMirror LRLanguage to new file

This separates the base language support from the LSP and color picker.

* Move the base CodeMirror KCL support to a local package

* Start CodeMirror grammar tests

* Exclude vitest config in tsconfig

* Add KCL path to tsconfig

* Remove stray import

* Drop extension from import

* Use __filename for commonjs compat

* Check exec return before access

* Build ES and CJS to dist

* Format

* Exclude all.test.ts from codespell

This is to work around "fileTests" imported from Lezer. Future codespell versions look
like they'll allow the code to be annotated, which would be nicer.

---------

Co-authored-by: Matt Mundell <matt@mundell.me>

packages/codemirror-lang-kcl/src/highlight.ts

@@ -0,0 +1,32 @@
+import { styleTags, tags as t } from '@lezer/highlight'
+
+export const kclHighlight = styleTags({
+  'import export': t.moduleKeyword,
+  ImportItemAs: t.definitionKeyword,
+  ImportFrom: t.moduleKeyword,
+  'fn var let const': t.definitionKeyword,
+  'if else': t.controlKeyword,
+  return: t.controlKeyword,
+  'true false': t.bool,
+  nil: t.null,
+  'AddOp MultOp ExpOp': t.arithmeticOperator,
+  BangOp: t.logicOperator,
+  CompOp: t.compareOperator,
+  LogicOp: t.logicOperator,
+  'Equals Arrow': t.definitionOperator,
+  PipeOperator: t.controlOperator,
+  String: t.string,
+  Number: t.number,
+  LineComment: t.lineComment,
+  BlockComment: t.blockComment,
+  Shebang: t.meta,
+  PipeSubstitution: t.atom,
+  VariableDefinition: t.definition(t.variableName),
+  VariableName: t.variableName,
+  PropertyName: t.propertyName,
+  TagDeclarator: t.tagName,
+  '( )': t.paren,
+  '{ }': t.brace,
+  '[ ]': t.bracket,
+  ', . : ? ..': t.punctuation,
+})