Add deAsyncify method to TSFunction

[codegen-sh]

Description

This PR adds a new deAsyncify method to the TSFunction class, which is the opposite of the existing asyncify method. The new method converts an async TypeScript function to a non-async function by:

1. Removing the async keyword
2. Unwrapping the return type from Promise<T> to just T

Implementation Details

• Added the deAsyncify method to TSFunction class in src/codegen/sdk/typescript/function.py
• Created comprehensive tests in tests/unit/codegen/sdk/typescript/function/test_function_deasyncify.py covering various scenarios:
  • Basic function conversion
  • Functions with decorators and docstrings
  • Arrow functions
  • Static methods
  • Generic functions
  • Functions with different return types (void, Promise, no return type)

Example Usage

// Before
async function getData(): Promise<string> {
    return "hello";
}

// After calling deAsyncify()
function getData(): string {
    return "hello";
}

This complements the existing asyncify method, giving developers the ability to toggle between async and non-async functions as needed.

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