feature: migration of workspaces between shards

[embik]

Feature Description

For a growing kcp instance, migrating logical clusters between shards might eventually become necessary, especially when single shard environments evolve to multi-shard ones. As such, it should be possible to migrate workspaces from one shard to another, either online or at the very least offline.

Proposed Solution

Unclear right now. Some mechanism to put logical clusters into maintenance, fetch all data stored in the underlying data store, send it to the other shard.

Alternative Solutions

No response

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Additional Context

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