feat: add const to determine whether to rotate coordinator

[hstove]

Added logic to use a const to determine whether to rotate coordinators when update_coordinator is called

[obycode]

lgtm!

[codecov]

Codecov Report

Attention: Patch coverage is 43.75000% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 83.15%. Comparing base (6daf973) to head (7891f7e).
Report is 1 commits behind head on dream-team-fixes.

Additional details and impacted files

@@                  Coverage Diff                  @@
##           dream-team-fixes    #4517       +/-   ##
=====================================================
+ Coverage             72.05%   83.15%   +11.10%     
=====================================================
  Files                   452      452               
  Lines                326179   326180        +1     
  Branches                323      323               
=====================================================
+ Hits                 235021   271235    +36214     
+ Misses                91150    54937    -36213     
  Partials                  8        8               

Files	Coverage Δ
stacks-signer/src/coordinator.rs	75.33% <43.75%> (+32.38%)	⬆️

... and 209 files with indirect coverage changes

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