Refactoring of CField struct to include gridindexingtype and interp_method #30

Job	Run time
py3.12 \| macos \| integration tests	14m 59s
py3.12 \| macos \| integration tests	14m 59s
py3.12 \| ubuntu \| integration tests	18m 22s
py3.12 \| ubuntu \| integration tests	18m 22s
py3.12 \| macos \| unit tests	11m 12s
py3.12 \| macos \| unit tests	11m 12s
py3.12 \| windows \| integration tests	34m 11s
py3.12 \| windows \| integration tests	34m 11s
py3.12 \| ubuntu \| unit tests	17m 54s
py3.12 \| ubuntu \| unit tests	17m 54s
py3.12 \| windows \| unit tests	28m 54s
py3.12 \| windows \| unit tests	28m 54s
py3.10 \| ubuntu \| unit tests	16m 31s
py3.10 \| ubuntu \| unit tests	16m 22s
py3.11 \| ubuntu \| unit tests	16m 50s
py3.11 \| ubuntu \| unit tests	16m 50s
	5h 17m 37s

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