Suggestion: add ability add user defined @protocols

My understanding is that there are currently no plans to be able to handle custom blocks as a generally accepted work around seems to be to implement some bridging code in Objective C. While it would be great (and somehow satisfying) if it were possible to do everyhting from Python, I still find the need to callback my Python code. Please tell me if there is a better way of doing this without grunging around in the details of Objective C, but I am using the @protocol functionality. When an function from a Framework calls a delegate, for example, this works very well in pyobjus. Unfortunately, it doesn't seem possible to define your own delegates, so I am having to "hack" an existing one like so:

test.m:

#include <Foundation/Foundation.h>
#include <AVFoundation/AVFoundation.h>

@interface MyObjCClass : NSObject {}
+ (void) testWithDelegate: (id<AVAsynchronousKeyValueLoading>) delegate
@end

@implementation MyObjCClass
+ (void) testWithDelegate: (id<AVAsynchronousKeyValueLoading>) delegate
{
    [delegate statusOfValueForKey: @"This is a test" error: nil];
}
@end

test.py:

from pyobjus import autoclass, protocol

MyObjCClass = autoclass('MyObjCClass')

Class Test():
    def __init__(self):
        MyObjCClass.testWithDelegate_(self)

    # massive hack!
    @protocol('AVAsynchronousKeyValueLoading')
    def statusOfValueForKey_error_(self.message, error):
        Logger.info(f"{message.UTF8String()}")  # outputs "This is a test"

FWIW, I'd be happy to contribute to this project, if that is helpful. If you encourage this, are there any basic guidelines or tips I should follow?

Thanks!

kivy / pyobjus

Suggestion: add ability add user defined @protocols #78