Add retry support for the ModelProvider.generate method

[SasinduDilshara]

Fixes: ballerina-platform/ballerina-library#8122

[codecov]

Codecov Report

❌ Patch coverage is 90.78947% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.64%. Comparing base (a5d1575) to head (a3b9e3b).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
ballerina/provider_utils.bal	90.54%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   50.60%   56.64%   +6.04%     
==========================================
  Files           4        4              
  Lines         249      286      +37     
  Branches       73       82       +9     
==========================================
+ Hits          126      162      +36     
- Misses        123      124       +1     

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