feat: adds fee in tx detail api

[raul-oliveira]

Motivation

Show the paid fee field in the explorer.

Acceptance Criteria

• Should return the fee header amount in the fee field.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[github-actions]

Bencher Report

Branch	raul-oliveira/fee-in-tx-detail-api
Testbed	ubuntu-22.04

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Benchmark	Latency	Benchmark Result minutes (m) (Result Δ%)	Lower Boundary minutes (m) (Limit %)	Upper Boundary minutes (m) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	1.68 m (-2.23%) Baseline: 1.72 m	1.55 m (92.05%)	2.06 m (81.48%)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.28%. Comparing base (dae8929) to head (03ca896).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1562      +/-   ##
==========================================
- Coverage   86.34%   86.28%   -0.07%     
==========================================
  Files         437      437              
  Lines       33610    33614       +4     
  Branches     5248     5249       +1     
==========================================
- Hits        29020    29003      -17     
- Misses       3588     3603      +15     
- Partials     1002     1008       +6     

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