AI Engine Pro 2.8.0

* Add: Sync Pull (to download remote embeddings - it does not insure that they have content however).
* Update: Better UI for Embeddings.
* Fix: Many fixes linked to AI Search, auto-retrieval of remote embeddings, and the way the data is handled.
* Fix: Minimum Score and Max Embeddings are now working correctly throughout the plugin.
* Fix: Unselecting an embedding environment will now remove the index and the namespace.
* Fix: A bunch of tiny additional fixes.

* Add: Support of multi-environments with embeddings (only Pinecone environments for now, but more will come soon).
* Fix: Various issues when using embeddings without namespaces.
* Fix: Various other little issues.

* Fix: The mwai_context_search was not being always called.
* Update: Many enhancements with the Embeddings to make them more flexible and powerful, with better error handling.