fix: downgrade chevrotain for tree-shaking

[CodyJasonBennett]

Fixes #287. Partial revert of #284.

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[donmccurdy]

@CodyJasonBennett I think this also requires a change to the build here:

three-stdlib/vite.config.ts

Line 8 in 6469af6

'@chevrotain/regexp-to-ast',

const inline: string[] = [
  'chevrotain',
  '@chevrotain/cst-dts-gen',
  '@chevrotain/gast',
-  '@chevrotain/regexp-to-ast',
+  'regexp-to-ast',
  '@chevrotain/types',
  '@chevrotain/utils',
  'lodash-es',
]

Will open a PR momentarily.

[CodyJasonBennett]

@donmccurdy, thanks. It's going through now.