Align `PackedDataChecksum::process` code path with `save` code path

• in PackedDataChecksum, re-use the save infrastructure to make sure that by construction the checksum is computed on exactly the same data that is actually saved as it now uses the same implementation
• remove the as_tuple infrastructure which is no longer required

note: sits on top of !3244 (closed) which fixes a lifetime issue in as_tuple -- so where !3244 (closed) fixes a bug, this eliminates the code in question...

added Persistency label

requested review from @rmatev

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• 51c8a6a7 - Reduce redundancy

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• 3620dae9 - Reduce redundancy

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• 5930ac7a - be more paranoid about lifetime,
• f893c0cb - Reduce redundancy

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/ci-test --merge

added ci-test-triggered label

• [2021-09-11 21:31] Validation started with lhcb-master-mr#2875

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• d62ac8d7 - be more paranoid about lifetime,
• c08a123a - Reduce redundancy

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mentioned in merge request !3244 (closed)

marked this merge request as ready

assigned to @chasse

mentioned in issue #151 (closed)

@chasse: given the discussion in #151 (closed), I would like to propose we get this merged...

removed review request for @rmatev

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• 5f33c660 - Reduce redundancy

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assigned to @msaur

resolved all threads

merged