Add support for Atomic Slot Migration to CLI

[murphyjacob4]

Adds a new option --cluster-use-atomic-slot-migration. This will apply to both --cluster reshard and --cluster rebalance commands.

We could do some more optimizations here, but for now we batch all the slot ranges for one (source, target) pair and send them off as one CLUSTER MIGRATESLOTS request. We then wait for this request to finish through polling CLUSTER GETSLOTMIGRATIONS once every 100ms. We parse CLUSTER GETSLOTMIGRATIONS and look for the most recent migration affecting the requested slot range, then check if it is in progress, failed, cancelled, or successful. If there is a failure or cancellation, we give this error to the user.

Fixes #2504

[codecov]

Codecov Report

❌ Patch coverage is 76.53846% with 61 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.61%. Comparing base (1cf0df9) to head (2287bef).

Files with missing lines	Patch %	Lines
src/valkey-cli.c	76.53%	61 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #2755      +/-   ##
============================================
+ Coverage     72.60%   72.61%   +0.01%     
============================================
  Files           128      128              
  Lines         71303    71526     +223     
============================================
+ Hits          51767    51941     +174     
- Misses        19536    19585      +49     

Files with missing lines	Coverage Δ
src/valkey-cli.c	57.06% <76.53%> (+0.84%)	⬆️

... and 10 files with indirect coverage changes

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