go/worker/common: Display additional information in the liveness status

[peternose]

oasis-node control status -a compute-2-internal-3562597129.sock
        "liveness": {
          "total_rounds": 15,
          "live_rounds": 15,
          "finalized_proposals": 7,
          "missed_proposals": 0
        },

[codecov]

Codecov Report

Merging #5402 (87fac85) into master (1d12295) will increase coverage by 0.29%.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5402      +/-   ##
==========================================
+ Coverage   66.18%   66.47%   +0.29%     
==========================================
  Files         534      534              
  Lines       56322    56324       +2     
==========================================
+ Hits        37279    37444     +165     
+ Misses      14614    14447     -167     
- Partials     4429     4433       +4     

Files	Coverage Δ
go/roothash/api/liveness.go	100.00% <ø> (ø)
go/worker/common/api/api.go	19.67% <ø> (+6.55%)	⬆️
go/worker/common/committee/node.go	60.52% <100.00%> (+0.61%)	⬆️

... and 68 files with indirect coverage changes