Adding in observed time to frontend

[ghost]

• Blocks and Transactions have their observed time pretty printed in JSON.
• Closes #24

[codecov[bot]]

Codecov Report

Merging #49 (044e36f) into main (7448ccf) will decrease coverage by 0.02%. The diff coverage is 0.00%.

@@           Coverage Diff            @@
##            main     #49      +/-   ##
========================================
- Coverage   8.44%   8.41%   -0.03%     
========================================
  Files          9       9              
  Lines        770     772       +2     
========================================
  Hits          65      65              
- Misses       703     705       +2     
  Partials       2       2              

Impacted Files	Coverage Δ
internal/service/frontend/frontend.go	0.00% <0.00%> (ø)

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