Fix json binding with union fields

[tefra]

📒 Description

xsdata's converter is really designed to work with string values from xml, in case of json with union fields like Union[bool, int, float] the parser will convert by accident float values to int or int values to bool

Resolves #862

🔗 What I've Done

It's not a pretty solution but use the convert to convert everything back to string, we could use the parse_int, parse_float of the json.loads but that would mean we are breaking compatibility with other json libraries.

💬 Comments

A place to write any comments to the reviewer.

🛫 Checklist

• Updated docs
• Added unit-tests
• Sample tests pass
• W3C tests pass

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (075e9da) 99.89% compared to head (f4af825) 99.89%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #864   +/-   ##
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  Coverage   99.89%   99.89%           
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  Files         104      104           
  Lines        9295     9298    +3     
  Branches     2078     2078           
=======================================
+ Hits         9285     9288    +3     
  Misses          3        3           
  Partials        7        7           

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication