Feature: add repo checking in the embed function

[a0m0rajab]

Type of feature

🍕 Feature

Current behavior

If a repo is embeded and we requested to embed it again, the server will run the embedding functions.
I would expect it to check if the repo is embeded or not, and provide a message based on that.

Suggested solution

add repo/collection checking function in the embed function.

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

Contributing Docs

• I agree to follow this project's Contribution Docs