Fix missing type and description when saved to json file

[cffls]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.96%. Comparing base (943c39e) to head (3081978).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pycardano/serialization.py	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #457      +/-   ##
==========================================
+ Coverage   89.90%   89.96%   +0.06%     
==========================================
  Files          33       33              
  Lines        4882     4994     +112     
  Branches      736      789      +53     
==========================================
+ Hits         4389     4493     +104     
- Misses        317      322       +5     
- Partials      176      179       +3     

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