[Epic:.NET] csharp-ast: support annotation for methods and parameters

[abrl91]

For example:

    [HttpGet]
    [Authorize(Roles = "admin,user")]
    public async Task<ActionResult<IEnumerable<TodoItemDto>>> TodoItems(
        [FromQuery] TodoItemFindMany findManyDto
    )
    {
        return Ok(await _service.TodoItems(findManyDto));
    }

[HttpGet] and [Authorize(Roles = "admin,user")] on the method level and [FromQuery] on the parameter level