fix(nano): serialization on state api

[glevco]

Motivation

The nanocontract state API was not properly serializing return values from view method calls. When calling view methods that returned complex types (like tuples), the serialization was only checking if the value was bytes and converting to hex, but didn't handle other types correctly.

Acceptance Criteria

• View method return values should be properly serialized using the method's return type specification
• The parse_nc_method_call function now returns the Method object to enable proper serialization
• Tests confirm that complex return types (like NamedTuples) are correctly serialized

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/get-state-serialization
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	1.79 m (+3.12%) Baseline: 1.73 m	1.56 m (87.28%)	2.08 m (85.93%)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.15%. Comparing base (a25e7ab) to head (6862c38).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1492      +/-   ##
==========================================
+ Coverage   86.12%   86.15%   +0.02%     
==========================================
  Files         437      437              
  Lines       33758    33757       -1     
  Branches     5275     5274       -1     
==========================================
+ Hits        29074    29083       +9     
+ Misses       3660     3654       -6     
+ Partials     1024     1020       -4     

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