Expose the default_version on the API

[eth3lbert]

This PR exposes the default_version on the API, which was introduced in #8484.
I implements this into multiple commits, which should be easier to follow and inspect :)

[codecov]

Codecov Report

Attention: Patch coverage is 98.63946% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.81%. Comparing base (f4c2cb9) to head (4256700).
Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
src/views.rs	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9741      +/-   ##
==========================================
+ Coverage   88.77%   88.81%   +0.04%     
==========================================
  Files         289      289              
  Lines       29701    29829     +128     
==========================================
+ Hits        26367    26494     +127     
- Misses       3334     3335       +1     

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