Add logs/metrics for block proposal

[dssei]

Describe your changes and provide context

Adding logs/metrics for block proposal

Testing performed to validate your change

n/a

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.16%. Comparing base (b352e3f) to head (c22381e).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #260      +/-   ##
==========================================
+ Coverage   58.09%   58.16%   +0.07%     
==========================================
  Files         249      249              
  Lines       34559    34563       +4     
==========================================
+ Hits        20078    20105      +27     
+ Misses      12886    12862      -24     
- Partials     1595     1596       +1     

Files with missing lines	Coverage Δ
internal/consensus/state.go	70.28% <100.00%> (+0.19%)	⬆️

... and 16 files with indirect coverage changes