Add wrapper for device code grant request

[kayathiri4]

Proposed changes in this pull request

Fixes https://github.com/wso2-enterprise/wso2-iam-internal/issues/2866

We are adding the wrapper to prevent missing of body parameters in the request. We follow the sam approach we used previously to fix similar issues:

• Fix issue of unable to read post body params in PAR endpoint #2277
• Sending access token through request body to oauth2/userinfo wso2/product-is#10387

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PR builder started
Link: https://github.com/wso2/product-is/actions/runs/12594605490

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.43%. Comparing base (9095d8d) to head (c5d5091).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2658      +/-   ##
============================================
+ Coverage     56.40%   56.43%   +0.02%     
+ Complexity     8269     8259      -10     
============================================
  Files           632      632              
  Lines         46680    46681       +1     
  Branches       8508     8508              
============================================
+ Hits          26332    26346      +14     
+ Misses        16585    16573      -12     
+ Partials       3763     3762       -1     

Flag	Coverage Δ
unit	38.75% <100.00%> (-0.03%)	⬇️

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PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/12594605490
Status: success

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Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/12594605490