fix(nano): allow fallback-related types on OCBs

[glevco]

Motivation

Some types are required to implement the fallback method, and they were not allowed on OCB imports. This PR fixes this.

Acceptance Criteria

• Allow fallback-related types on OCBs (NCArgs, NCRawArgs, NCParsedArgs).
  • Move those types from runner.types to nanocontracts.types.
• Add test for calling the fallback as as internal method.

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/missing-ocb-types
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	1.68 m (+2.41%) Baseline: 1.64 m	1.48 m (87.88%)	1.80 m (93.10%)

🐰 View full continuous benchmarking report in Bencher

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.62%. Comparing base (1927f37) to head (c8baf05).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1339      +/-   ##
==========================================
- Coverage   85.66%   85.62%   -0.04%     
==========================================
  Files         424      424              
  Lines       32120    32119       -1     
  Branches     4997     4997              
==========================================
- Hits        27516    27503      -13     
- Misses       3604     3610       +6     
- Partials     1000     1006       +6     

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