fix(nano): Fix NCCreationResource to get contract information from the global state

[msbrogli]

Motivation

NCCreationResource was previously getting contract information from the vertex that created that contract. But this does not work for contracts created by contracts. This PR fixes that.

Acceptance Criteria

1. If a contract creation vertex is not found, get contract information from the best block's global state. In this case, the created_at is set to zero.

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/nano-nc_creation-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	2.05 m (+19.72%) Baseline: 1.71 m	1.54 m (75.18%)	2.05 m (99.77%)

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[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.76%. Comparing base (8e6ea50) to head (33a2888).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
hathor/nanocontracts/resources/nc_creation.py	83.33%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1425      +/-   ##
==========================================
- Coverage   85.77%   85.76%   -0.02%     
==========================================
  Files         431      431              
  Lines       33115    33133      +18     
  Branches     5193     5196       +3     
==========================================
+ Hits        28406    28416      +10     
- Misses       3671     3677       +6     
- Partials     1038     1040       +2     

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