Make SnapshotsInProgress Diffable (#89619)

This is very important for #77466. Profiling showed that serializing snapshots-in-progress when there's a few snapshots with high shard count running takes a significant amount of CPU and heap for sending the full data structure over an over. This PR adds diffing in the simplest way I could think of on top of the existing data structure. closes #88732
elastic · Sep 13, 2022 · b69d1bd · b69d1bd
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diff --git a/docs/changelog/89619.yaml b/docs/changelog/89619.yaml
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+pr: 89619
+summary: Make `SnapshotsInProgress` Diffable
+area: Snapshot/Restore
+type: enhancement
+issues:
+ - 88732