chore: convert blocking calls to async calls in some providers

[jaideepr97]

What does this PR do?

Converts blocking calls to async calls within the following providers/components:

• runpod (inference)
• sentence_transformers (inference)
• litellm (inference)

Partially addresses #1489

Test Plan

[Describe the tests you ran to verify your changes with result summaries. Provide clear instructions so the plan can be easily re-executed.]