Feat: add an endpoint for listing which nodes host a stackerdb replica

[jcnelson]

Got one quick PR for the upcoming 2.4.0.1.0 release -- the ability to ask a node for the list of nodes it knows replicate a given StackerDB. If a user adds a StackerDB replica to their node, they can assess how quickly other (public) nodes learn of it.

[codecov]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (71355c5) 82.29% compared to head (ff7c549) 76.50%.
Report is 1 commits behind head on release/2.5.0.1.0.

Files	Patch %	Lines
stackslib/src/net/api/liststackerdbreplicas.rs	89.52%	11 Missing ⚠️
...ackslib/src/net/api/tests/liststackerdbreplicas.rs	95.34%	4 Missing ⚠️
stackslib/src/net/stackerdb/sync.rs	50.00%	2 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           release/2.5.0.1.0    #4270      +/-   ##
=====================================================
- Coverage              82.29%   76.50%   -5.79%     
=====================================================
  Files                    402      404       +2     
  Lines                 292005   292281     +276     
=====================================================
- Hits                  240295   223614   -16681     
- Misses                 51710    68667   +16957     

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[obycode]

Is this supposed to be merging into release/2.5.0.1.0?

[jcnelson]

The branch name has a typo. That's supposed to be 2.4.0.1.0

[obycode]

lgtm

[jferrant]

LGTM! :)