Add multiple model support via Litellm

Big thanks to @pradhyumna85 for this PR.

What's Changed

• FEAT: Introducing support for vision models from all major providers like Azure OpenAI, Anthropic etc and custom system prompt in python SDK by @pradhyumna85 in #21
• fix - missing total token count calculation for maintain_format = False by @pradhyumna85 in #32

New Contributors

• @pradhyumna85 made their first contribution in #21

Full Changelog: v0.0.2...v0.1.0