This PR makes the following changes:
- Update look & feel of contextual insights (previously called prompts)
according to the new design that is being developed. Some things might
still change, but hopefully not too much.
- Move all the Observability AI Assistant (previously called CoPilot)
code into a separate plugin for better isolation, more specific code
ownership and to solve some circular dependency issues
- Use connectors instead of a kibana.yml setting
Note: for OpenAI, the model is currently hardcoded to `gpt-4` until
https://github.com/elastic/kibana/issues/162204 has been addressed.
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Co-authored-by: Coen Warmer <coen.warmer@gmail.com>
Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
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