Implementation: Suggested Code fixes

[timotheeguerin]

From design #497

Change

• Diagnostic takes a new property fixes which is a list of code fixes that can be run.

reportDiagnostic(program, {
   code: "library-not-found", 
   message: "Cannot find library @cadl-lang/rest",
   target: node,
   codefixes: [
     createInstallLibCodeFix("@cadl-lang/rest"),
   ]
})

export interface CodeFix {
  id: string;
  label: string;
  fix: (fixContext: FixContext) => CodeFixAction | CodeFixAction[] | Promise<void> | void
}

export interface FixContext {
  replaceText(node: Node, newText: string): CodeAction;
}

export function createInstallLibCodeFix(library: string) {
  return {
    id: "install-lib",
    label: "Install library",

  }
}

Rules that could have a simple fixer:

• no-enum https://github.com/Azure/typespec-azure/pull/3915

[markcowl]

estimate: 13