Changing pycv into a proper python package #3356

Job	Run time
codecheck / codecheck	44m 29s
conda / conda (ubuntu-20.04)	11m 34s
docker / docker (fedora39)	19m 55s
linux / linux (-doc-mpi-)	42m 4s
conda / conda (macos-13)	28m 6s
docker / docker (rocky8)	24m 40s
linux / linux (-mpi-)	52m 48s
conda / conda (macos-14)	7m 41s
mac / macports (macos-13)	21m 19s
linux / linux (-coverage-mpi-)	1h 4m 40s
mac / macports (+allmodules, macos-13)	28m 9s
linux / linux (-debug-)	31m 51s
linux / linux (-debug-mpi-)	41m 36s
linux / linux (-intel-)	47m 30s
linux / linux (-pycv-mpi-)	18m 28s
linux / linux (-nvhpc-mpi-)	55m 4s
mac / macsimple (macos-13)	13m 58s
mac / macsimple (macos-14)	5m 25s
	9h 19m 17s

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