feat(BUX-168, BUX-172): BEEF v2 (unmined inputs) + complex SPV

[wregulski]

Pull Request Checklist

• 📖 I created my PR using provided : CODE_STANDARDS
• 📖 I have read the short Code of Conduct: CODE_OF_CONDUCT
• 🏠 I tested my changes locally.
• ✅ I have provided tests for my changes.
• 📝 I have used conventional commits.
• 📗 I have updated any related documentation.
• 💾 PR was issued based on the Github or Jira issue.

[codecov]

Codecov Report

Merging #497 (9f93b3c) into master (8c5d26a) will increase coverage by 0.37%.
The diff coverage is 53.46%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #497      +/-   ##
==========================================
+ Coverage   52.58%   52.96%   +0.37%     
==========================================
  Files         106      108       +2     
  Lines       11166    11214      +48     
==========================================
+ Hits         5872     5939      +67     
+ Misses       4827     4809      -18     
+ Partials      467      466       -1     

Flag	Coverage Δ
unittests	52.96% <53.46%> (+0.37%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
beef_tx_mock.go	100.00% <100.00%> (ø)
chainstate/merkle_root_provider.go	0.00% <ø> (ø)
chainstate/transaction.go	94.84% <100.00%> (-0.11%)	⬇️
client_options.go	74.17% <ø> (-0.06%)	⬇️
db_model_transactions.go	59.73% <ø> (+0.94%)	⬆️
model_bump.go	75.00% <100.00%> (+5.56%)	⬆️
model_transaction_config.go	80.98% <ø> (ø)
tasks.go	0.00% <ø> (ø)
tx_repository.go	28.49% <100.00%> (-16.21%)	⬇️
paymail.go	55.79% <75.00%> (-0.55%)	⬇️
... and 13 more

... and 1 file with indirect coverage changes

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