added SchemaConverter interface for controlling Schema generation

[asafbennatan]

solves #159

1.added SchemaConverter interface for controlling Schema generation
2.added DefaultSchemaConverter for running the default (same logic that we had before in JsonSchemaUtil) - note this also improves performance as previously schema creator was created per serialization
3. JsonSchemaUtil is not really necessary anymore but kept to be compatible;

[sashirestela]

Please, follow the guidelines for contributions: https://github.com/sashirestela/simple-openai/blob/main/CONTRIBUTING.md

[asafbennatan]

@sashirestela fixed formatting , anything else ?

[sashirestela]

@asafbennatan The build has failed. Take a look at:

https://github.com/sashirestela/simple-openai/actions/runs/10005920792/job/27698385663?pr=160

[asafbennatan]

@sashirestela done , please review

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.71%. Comparing base (5db4c2c) to head (4d3fbb0).

Files	Patch %	Lines
...restela/openai/support/DefaultSchemaConverter.java	87.50%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##               main     #160      +/-   ##
============================================
+ Coverage     89.62%   89.71%   +0.08%     
- Complexity      697      700       +3     
============================================
  Files           101      102       +1     
  Lines          1465     1468       +3     
  Branches         31       31              
============================================
+ Hits           1313     1317       +4     
+ Misses          107      106       -1     
  Partials         45       45              

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