fix(images): correct variation API return type to List<OpenAIImageData>

- Change variation() return type from List<OpenAIImageModel> to List<OpenAIImageData>
- Update interface and implementation to match actual API response structure
- Simplify response parsing by directly mapping data array to OpenAIImageData
- Fix example usage to work with correct return type
- Update tests: remove deprecated model.permission checks; fix audio transcription type assertions; correct file.list() return type handling

[ Remove ] reverted back the impl for stream timeout appliance

[ Edit ] fixed some issue caught at package deploy, minor changes

[ Edit ] disabled the debugging print method in the streaming http cl…

…ient method

[ Add ] version 4.1.1

[ Add ] release 1.9.0

[ Add ] release 1.8.4

[ Add ] 1.8.0 release

[ Fix ] fixed analyser type issue, edited documentation

[ Remove ] removed title in Readme.md