Refactor enums comparison operators for performance improvements

[jhonabreul]

Refactor enums comparison operators for performance improvements.
Introduce new EnumObject class to handle managed enums and their comparison operations.

Performance test:

publicvoidPerformanceTest(){usingvar_=Py.GIL();usingvarmodule=PyModule.FromString("PerformanceTest",$@"from System import DayOfWeekdef test(): result = True enum_value = DayOfWeek.MONDAY for _ in range(500000): result = result and enum_value == DayOfWeek.MONDAY and enum_value != DayOfWeek.FRIDAY return result");varstopwatch=Stopwatch.StartNew();Assert.IsTrue(module.InvokeMethod("test").As<bool>());stopwatch.Stop();Console.WriteLine($"Total time: {stopwatch.Elapsed.TotalSeconds}s");}

Master:

Total time: 18.6504161s Total time: 19.0529056s Total time: 19.0023384s Total time: 18.5928232s Total time: 18.7222117s 

Avg: 18.8s

Branch:

Total time: 0.5745701s Total time: 0.5748509s Total time: 0.5982596s Total time: 0.5831667s Total time: 0.564322s 

Avg: 0.58s

The test is ~32x faster.