Feature/sambanovacloud integration dify

[rodrigo-92]

Summary

Hi, I work for SambaNova and we're very interested in integration our LLMs in Dify! Please take a look at this PR and let me know if there's anything I can help with to complete this merge :). I've already created an issue here
close https://github.com/langgenius/dify/issues/11615 close https://github.com/langgenius/dify/issues/13470

Screenshots

Checklist

[!IMPORTANT]

• [x] This change requires a documentation update, included: Dify Document
• [x] I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• [ ] I've updated the documentation accordingly.
• [x] I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods