Conversation API new features added to docs

[sicoyle]

What content needs to be created or modified?
I added prompt caching, updated response caching, added model on the response, added resiliency timeout support, and usage metrics to the conversation api. Docs need to be added/updated for these.

Describe the solution you'd like
conversation api docs updated

Where should the new material be placed?
conversation api

The associated pull request from dapr/dapr, dapr/components-contrib, or other Dapr code repos
dapr/dapr#9316
dapr/components-contrib#4154
dapr/components-contrib#4129

Additional context

[sicoyle]

/assign