Add deAsyncify method to convert async TypeScript functions to synchronous

[codegen-sh]

This PR adds a new deAsyncify method to TypeScript functions, function types, and function calls, which is the opposite of the existing asyncify method.

Changes

• Added deAsyncify() method to TSFunction that:

  • Removes the 'async' keyword from function declarations
  • Unwraps return types from Promise<T> to just T

• Added deAsyncify() method to TSFunctionType that:

  • Unwraps return types from Promise<T> to just T

• Added deAsyncify() method to FunctionCall that:

  • Removes 'await' keywords from function calls
  • Handles parenthesized await expressions

Usage

// Before
async function getData(): Promise<string> {
  const result = await fetchData();
  return result;
}

// After deAsyncify()
function getData(): string {
  const result = fetchData();
  return result;
}

This PR addresses the request to create a function that makes async TypeScript functions non-async, similar to how the asyncify function works but in reverse.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

codegen-bot seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}