Replace ruby-openai library usage with directly Net::HTTP direct calls.

[andreibondarev]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Describe the solution you'd like
A clear and concise description of what you want to happen.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[khaile]

Hi @andreibondarev , Could you please provide more context? I would love to take over this.