Support async callback in linter

[RodgeFu]

• Add 'exitRoot' final event for semantic walker and linter rules
• Support 'async' in linter definition and async function as callback for 'exitRoot' event.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/microsoft/typespec/@typespec/compiler@8942

commit: 13d034a

[github-actions]

All changed packages have been documented.

• ✅ @typespec/compiler

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@typespec/compiler - feature ✏️

• Add 'exit' final event for linter rules,> - Support 'async' in linter definition and async function as callback for 'exit' event.

[azure-sdk]

You can try these changes here

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