[PR] [load balance] Add load balance framework [iotdb]

["HxpSerein (via GitHub)" <gi...@apache.org>]

HxpSerein opened a new pull request, #16839:
URL: https://github.com/apache/iotdb/pull/16839

   ## Description
   
   This PR adds a region rebalancing feature that allows users to submit a rebalance task through a single `Load Balance` SQL command.
   
   ### Automated migration plan
   A new cost-aware balancing algorithm computes the optimal region migration plan, which is executed distributedly by the management node.
   
   ### Not limited to scaling scenarios
   The feature works not only for cluster expansion/shrinking but also for general data skew cases (e.g., uneven region sizes caused by concentrated write load).
   
   ### Improves cluster balance
   Helps address storage imbalance and write-load imbalance across DataNodes, keeping the cluster healthier and more stable.


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