Explicitly pack empty KeyedContainers and Relations Tables

Due to SelectivePacker natively packing 'elements' of containers it did not transitively pack anything if, and only if, it was given an empty container. This MR explicitly packs empty KeyedContainers and RelationTables as empty packed objects. In addition, it reduces some code duplication between the KeyedContainers and RelationTable cases.

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• 4b59cd21 - pack empty containers

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mentioned in merge request DaVinci!928 (merged)

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• af8a278d - pack empty containers

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• e67a0245 - pack empty keyedcontainers

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• 94e23418 - pack empty keyedcontainers

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• 8bb7b53c - pack empty keyedcontainers

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marked this merge request as ready

changed title from Draft: Pack empty keyedcontainers to Pack empty KeyedContainers

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marked this merge request as draft

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• d7ee2e64 - pack empty keyedcontainers

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• 599fdcae - pack empty keyedcontainers

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• 599fdcae...4f895623 - 16 commits from branch master
• 9a62b0a8 - pack empty keyedcontainers
• 6c59966a - unify ContainerRange for KeyedContainer and Relations1D

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• c44b5a6c - unify ContainerRange for KeyedContainer and Relations1D

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• daea2da5 - add support for packing empty relation tables

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