go/control: Show local checkpoint heights

[martintomazic]

Closes #5823.

Overlap with oasisprotocol/docs#1363 (comment).

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[martintomazic]

If you previously had checkpointer enabled (and you have some checkpoints), then you restart a node and disable checkpoints, you would still show old checkpoints. Could this confuse node operators?

[kostko]

You could also show information on whether the checkpointer is currently enabled or not.

[martintomazic]

You could also show information on whether the checkpointer is currently enabled or not.

You mean to only show it if the checkpointer is enabled? I think this would be good.

Alternative is to show the status of the checkpointer directly:
consensus.checkpointer.enabled/heights or possibly consensus.state.checkpointer.enabled/heights?

I notice for the consensus we tend to display "domain view" (current solution), whereas for the runtimes we tend to show status of independent components (alternative solution).

[martintomazic]

I have kept is simple and only show it if checkpointer is enabled.

[codecov]

Codecov Report

❌ Patch coverage is 52.38095% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.36%. Comparing base (5d1c3ea) to head (66596ab).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
go/consensus/cometbft/full/common.go	52.38%	8 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6265      +/-   ##
==========================================
- Coverage   64.37%   64.36%   -0.02%     
==========================================
  Files         697      697              
  Lines       67836    67854      +18     
==========================================
+ Hits        43670    43674       +4     
- Misses      19155    19171      +16     
+ Partials     5011     5009       -2     

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