feat: support async shorthand methods

[DylanPiercey]

Threads htmljs-parser's new async flag through the AST and the script extractor, so the body of <button async onClick() { await save() }> type-checks as an async function. Also adds a TextMate rule for the keyword, and keeps a whitespace preceded >= inside an attribute value rather than ending the tag.

Requires htmljs-parser 5.14.

[changeset-bot]

🦋 Changeset detected

Latest commit: fe9b102

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@marko/language-server	Minor
@marko/language-tools	Minor
@marko/ts-plugin	Minor
@marko/type-check	Minor
marko-vscode	Minor

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⛔ Files ignored due to path filters (14)

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📒 Files selected for processing (11)

• .changeset/async-attr-method-shorthand.md
• packages/language-server/package.json
• packages/language-server/src/__tests__/fixtures/script/attr-method-async/components/my-tag.marko
• packages/language-server/src/__tests__/fixtures/script/attr-method-async/index.marko
• packages/language-tools/package.json
• packages/language-tools/src/extractors/script/index.ts
• packages/language-tools/src/extractors/script/util/script-parser.ts
• packages/language-tools/src/parser.ts
• packages/ts-plugin/package.json
• packages/type-check/package.json
• packages/vscode/syntaxes/marko.tmLanguage.json

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