Reimplement managed raster class in C++ #3861

Job	Run time
Check for syntax errors	14s
Check HISTORY RST syntax	12s
Run Workbench Tests (windows-latest)	5m 13s
Run model tests (3.8, windows-latest)	8m 20s
Run Workbench Tests (macos-13)	1m 9s
Check sdist (3.8, windows-latest)	3m 23s
Run model tests (3.8, macos-13)	2m 1s
Validate Sampledata & User Guide	5m 33s
Check sdist (3.8, macos-13)	1s
Run model tests (3.9, windows-latest)	8m 1s
Check sdist (3.9, windows-latest)	2m 58s
Run model tests (3.9, macos-13)	1m 50s
Build binaries (macos-13)	1m 31s
Check sdist (3.9, macos-13)	1s
Build sampledata archives	4m 30s
Run model tests (3.10, windows-latest)	8m 5s
Build binaries (windows-latest)	11m 6s
Check sdist (3.10, windows-latest)	2m 44s
Run model tests (3.10, macos-13)	1m 30s
Check sdist (3.10, macos-13)	1m 33s
Run model tests (3.11, windows-latest)	9m 5s
Check sdist (3.11, windows-latest)	3m 43s
Run model tests (3.11, macos-13)	1m 55s
Check sdist (3.11, macos-13)	29s
Run model tests (3.12, windows-latest)	9m 6s
Check sdist (3.12, windows-latest)	3m 3s
Run model tests (3.12, macos-13)	1m 28s
Check sdist (3.12, macos-13)	22s
	1h 39m 6s

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