[Bug]: GroupOnObservable emits too many changesets

[dwcullop]

Describe the bug 🐞

While the operator minimizes the number of group changesets, it doesn't try to reduce the number of changesets emitted by the Group Caches.

For example, if the source provides a changeset with 9 Additions such that it should be split into 3 groups of 3, then the group observable will emit a single changeset to add 3 groups, but each of the groups would emit a 3 changesets with 1 add each (for a total of 10 changesets).

Step to reproduce

Any use of the GroupOnObservable will exhibit this behavior.

Reproduction repository

https://github.com/dwcullop/DynamicData

Expected behavior

There should only be 4 total changesets emitted. One to add the 3 groups and then each group should emit a single changeset with all 3 adds together.

Screenshots 🖼️

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IDE

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Operating system

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Version

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Device

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DynamicData Version

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Additional information ℹ️

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[github-actions]

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