first working version of obbt in MindtPy #450

Job	Run time
lint/style-and-typos	52s
linux/3.8/bare-env	10s
linux/3.12	24m 9s
osx/3.10	13m 2s
win/3.9	2h 0m 8s
linux/3.11/conda	29m 28s
linux/3.10/mpi	2m 27s
linux/3.11/singletest	46m 59s
linux/3.10/cython	21m 15s
win/3.8/pip	48m 45s
process-coverage-${{ matrix.TARGET }}	0s
	5h 7m 15s

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