Feature request: CRUD for Prompt API

[barseghyanartur]

Describe the feature or potential improvement

At the moment, it's not possible to perform a clean-up of old prompts programmatically.

It would be beneficial to implement full CRUD functionality for prompts, as it would address the shortcomings of LangFuse in more complex workflows that deviate from standard LangFuse practices.

Finally, in addition to the standard create, read, update, and delete operations, a couple of specialized endpoints would be useful too:

• Remove all prompts by name except the latest production version.
• Remove all prompts by name and tag.

Naturally, reflecting the changes in the SDK is desirable too.

Additional information

No response