feat(nano): key-mangling continuation

[jansegre]

Motivation

When merging #1312 we left some changes to be made in a future PR, this is the PR.

Acceptance Criteria

• Do not initialize fields implicitly.
• Fail execution of initialize call if there are fields that were not initialized.
• Add more complete tests with more nested container combinations.

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	feat/nano/key-mangling2
Testbed	ubuntu-22.04

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	1.96 m (+14.01%) Baseline: 1.72 m	1.55 m (78.94%)	2.07 m (95.01%)

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[codecov]

Codecov Report

❌ Patch coverage is 69.81132% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.87%. Comparing base (49a9ac1) to head (70e9c43).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
hathor/nanocontracts/fields/field.py	45.45%	6 Missing ⚠️
hathor/nanocontracts/runner/runner.py	66.66%	2 Missing and 2 partials ⚠️
hathor/nanocontracts/fields/container.py	80.00%	2 Missing ⚠️
hathor/nanocontracts/fields/deque_container.py	50.00%	2 Missing ⚠️
hathor/nanocontracts/fields/dict_container.py	86.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1417      +/-   ##
==========================================
- Coverage   85.96%   85.87%   -0.10%     
==========================================
  Files         434      434              
  Lines       33673    33675       +2     
  Branches     5280     5278       -2     
==========================================
- Hits        28948    28919      -29     
- Misses       3684     3703      +19     
- Partials     1041     1053      +12     

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