Add the class `PyObjectPtr` to manage reference counting. #1945

Job	Run time
XML validation	13s
MSIS code validation (ubuntu-latest)	7s
MSIS code validation (macos-latest)	9s
C/C++ build (MSVC) (ON)	5m 1s
C/C++ build (Linux) (ubuntu-22.04, ON, ON, OFF, ON)	2m 43s
C/C++ build (MSVC) (OFF)	4m 6s
C/C++ build (MinGW) (ON)	4m 9s
C/C++ build (Linux) (ubuntu-22.04, ON, OFF, OFF, ON)	2m 55s
C/C++ build (MacOSX) (macos-12, 3.8)	3m 19s
C/C++ build (MinGW) (OFF)	3m 9s
C/C++ build (Linux) (ubuntu-22.04, OFF, ON, OFF, ON)	2m 47s
C/C++ build (MacOSX) (macos-14, 3.10)	2m 34s
C/C++ build (Linux) (ubuntu-22.04, OFF, OFF, OFF, ON)	2m 48s
C/C++ build (Linux) (ubuntu-20.04, OFF, OFF, ON, OFF)	4m 46s
Build Python Module from Source	0s
Code coverage	0s
Build Python wheels	0s
Matlab S-Function	0s
Build Windows installer	0s
Deploy Stable Release	0s
Deploy Rolling Release	0s
Deploy Documentation	0s
	38m 46s

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