fix(dag_builder): Fix generating two or more vertices with the same hash

[msbrogli]

Motivation

If might happen that two different transactions have the same hash if their description is exactly the same. This PR fixes it by increasing the nonce.

Acceptance Criteria

1. Assert that each transaction has a unique hash.
2. Fix conflicts by increasing the nonce.
3. Set a maximum of 100 attempts to fix conflicts. If it fails, an exception is raised.

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	fix/dag-builder-hash-conflict
Testbed	ubuntu-22.04

🚨 1 Alert

Benchmark	Measure Units	View	Benchmark Result (Result Δ%)	Lower Boundary (Limit %)
sync-v2 (up to 20000 blocks)	Latency minutes (m)	📈 plot 🚨 alert (🔔) 🚷 threshold	1.48 (-10.41%)	1.48 (100.46%)

Click to view all benchmark results

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 alert (🔔) 🚷 view threshold	1.48 (-10.41%)	1.48 (100.46%)	1.81 (81.44%)

🐰 View full continuous benchmarking report in Bencher

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 83.65%. Comparing base (a3bf50c) to head (8b02ba5).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
hathor/dag_builder/vertex_exporter.py	75.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1207      +/-   ##
==========================================
+ Coverage   83.58%   83.65%   +0.07%     
==========================================
  Files         320      320              
  Lines       24551    24562      +11     
  Branches     3764     3767       +3     
==========================================
+ Hits        20520    20547      +27     
+ Misses       3267     3256      -11     
+ Partials      764      759       -5     

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