Adding ti index to the ravelled particle index too #612

Job	Run time
mypy	3m 36s
py3.13 \| macos \| integration tests	12m 2s
py3.13 \| macos \| unit tests	8m 38s
py3.13 \| ubuntu \| integration tests	13m 38s
py3.13 \| ubuntu \| unit tests	10m 34s
py3.13 \| windows \| integration tests	22m 9s
py3.13 \| windows \| unit tests	13m 33s
py3.10 \| ubuntu \| integration tests	24m 41s
py3.10 \| ubuntu \| unit tests	11m 19s
py3.11 \| ubuntu \| unit tests	10m 45s
py3.12 \| ubuntu \| unit tests	10m 46s
merge-test-artifacts	2s
	2h 21m 43s

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