fix(nano): fix NC context on tx API

[glevco]

Motivation

Fix compatibility with existing APIs.

Acceptance Criteria

• Readd address attribute to Context.to_json(), for compatibility with existing APIs.

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/tx-api-nc-context
Testbed	ubuntu-22.04

🚨 1 Alert

Benchmark	Measure Units	View	Benchmark Result (Result Δ%)	Upper Boundary (Limit %)
sync-v2 (up to 20000 blocks)	Latency minutes (m)	📈 plot 🚷 threshold 🚨 alert (🔔)	1.83 m (+10.31%) Baseline: 1.66 m	1.82 m (100.28%)

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 threshold 🚨 view alert (🔔)	1.83 m (+10.31%) Baseline: 1.66 m	1.49 m (81.59%)	1.82 m (100.28%)

🐰 View full continuous benchmarking report in Bencher

[codecov]

Codecov Report

❌ Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.60%. Comparing base (93ded98) to head (d807a7f).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
hathor/nanocontracts/context.py	57.14%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1368      +/-   ##
==========================================
- Coverage   85.63%   85.60%   -0.04%     
==========================================
  Files         429      429              
  Lines       32433    32440       +7     
  Branches     5067     5069       +2     
==========================================
- Hits        27773    27769       -4     
- Misses       3632     3635       +3     
- Partials     1028     1036       +8     

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