Add sentinel_total_tilt to sentinel INFO sentinel

[carlosfu]

it will be a good idea to add total_tilt in info command to show total tilt count, in order to help admin to know sentinel tilt condition.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71.03%. Comparing base (09f9630) to head (ac632b2).
Report is 17 commits behind head on unstable.

Files with missing lines	Patch %	Lines
src/sentinel.c	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1904      +/-   ##
============================================
+ Coverage     71.00%   71.03%   +0.02%     
============================================
  Files           123      123              
  Lines         65675    65706      +31     
============================================
+ Hits          46631    46671      +40     
+ Misses        19044    19035       -9     

Files with missing lines	Coverage Δ
src/sentinel.c	0.00% <0.00%> (ø)

... and 14 files with indirect coverage changes

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[hwware]

I do not understand why admin need to know the total number of the tilt, tilt is only a status, it can be entered or exited.

[kukey]

@hwware When sentinel enters titl, it will affect the cluster's failover. If the number of entries is too more, in general may need to rebalance the sentinel.

[hwware]

Please sign your DCO, Thanks

[enjoy-binbin]

@valkey-io/core-team Looks like a minor optimization for sentinel, please approval or comment.

[hwware]

@carlosfu Please update the updated-doc PR here, and we will merge this PR, Thanks