C++ ARIMA fixes and refactoring #1768

Job	Run time
test-m3-performance	2m 42s
Run tests for cp39-manylinux_x86_64	11m 58s
Run tests for cp39-manylinux_aarch64	3m 30s
Run tests for cp39-win_amd64	10m 18s
Run tests for cp39-macosx_x86_64	3m 37s
Run tests for cp39-macosx_arm64	1m 21s
Run tests for cp310-manylinux_x86_64	12m 49s
Run tests for cp310-manylinux_aarch64	3m 24s
Run tests for cp310-win_amd64	9m 17s
Run tests for cp310-macosx_x86_64	2m 34s
Run tests for cp310-macosx_arm64	1m 17s
Run tests for cp311-manylinux_x86_64	12m 24s
Run tests for cp311-manylinux_aarch64	3m 14s
Run tests for cp311-win_amd64	9m 46s
Run tests for cp311-macosx_x86_64	2m 3s
Run tests for cp311-macosx_arm64	1m 14s
Run tests for cp312-manylinux_x86_64	7m 21s
Run tests for cp312-manylinux_aarch64	3m 22s
Run tests for cp312-win_amd64	8m 40s
Run tests for cp312-macosx_x86_64	3m 23s
Run tests for cp312-macosx_arm64	1m 50s
publish-nightly-wheels	0s
	1h 56m 4s

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