Implement Sprucing cache

Needs !2392 (merged)

Work towards DPA task https://gitlab.cern.ch/lhcb-dpa/project/-/issues/87.

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assigned to @nskidmor

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• 0ea9532b - comment

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Should we test this ? The description seems to imply it's not ready, but it's not Draft either

marked this merge request as draft

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• 0ea9532b...dd7afc78 - 39 commits from branch master
• eac7eb6a - First sprucing cache
• 325286fe - comment
• 5b2c7fdf - gaudi try

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• ba8a3a6f - working

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• 17021072 - working

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@cburr passthrough sprucing jobs require order 10 DecReport filters. I believe this does not warrant a cache

This is the memory consumption when using the cache

requested review from @cburr

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• 31c39c8a - debug

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This is looking great; excellent work !