Add GDALDataset::[Get|Compute]InterBandCovarianceMatrix() and corresponding C and Python API #25312

Job	Run time
cppcheck_master	8m 16s
linting	1m 35s
validate_xml	27s
check-config-options	15s
cmake-lint	0s
cppcheck_2004	8m 2s
cppcheck_2404	8m 3s
binary_files	21s
other_checks	32s
check-driver-connection-prefix	15s
code_quality_checks	1m 24s
	29m 10s

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