Add the class `PyObjectPtr` to manage reference counting. #1948

Job	Run time
MSIS code validation (ubuntu-latest)	8s
MSIS code validation (macos-latest)	10s
XML validation	14s
C/C++ build (Linux) (ubuntu-22.04, ON, ON, OFF, ON)	3m 38s
C/C++ build (MSVC) (ON)	6m 10s
C/C++ build (MacOSX) (macos-12, 3.8)	4m 20s
C/C++ build (MinGW) (ON)	2m 5s
C/C++ build (MSVC) (OFF)	4m 23s
C/C++ build (MacOSX) (macos-14, 3.10)	2m 38s
C/C++ build (MinGW) (OFF)	3m 59s
C/C++ build (Linux) (ubuntu-22.04, ON, OFF, OFF, ON)	4m 14s
C/C++ build (Linux) (ubuntu-22.04, OFF, ON, OFF, ON)	4m 23s
C/C++ build (Linux) (ubuntu-22.04, OFF, OFF, OFF, ON)	4m 19s
C/C++ build (Linux) (ubuntu-20.04, OFF, OFF, ON, OFF)	5m 46s
Build Python Module from Source (ubuntu-latest, 3.8)	2m 55s
Build Python Module from Source (macos-latest, 3.8)	3m 3s
Build Python Module from Source (windows-latest, 3.8)	2m 57s
Build Python Module from Source (3.9, windows-latest)	3m 11s
Code coverage	2m 0s
Matlab S-Function (macos-12)	8m 17s
Matlab S-Function (ubuntu-22.04)	3m 22s
Build Python wheels	0s
Matlab S-Function (windows-latest)	6m 0s
Build Windows installer	34s
Deploy Rolling Release	7s
Deploy Stable Release	0s
Deploy Documentation	0s
	1h 18m 53s

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