Admin/XMover: Active shard monitoring

[amotl]

About

Monitoring active shards is another tool for the XMover utility that uses CrateDB's system tables to find out about cluster imbalances related to shard number and shard size distribution across the whole cluster.

Note: This PR is stacked upon GH-547.

References

• Looking-glass utilities for exploring what's going on: CrateDB shard analysis and beyond #513

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch xmover-active-shard-monitoring

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