This PR extracts the streaming diff implementation to its own
`streaming_diff` crate.
It was duplicated between `assistant` and `assistant2`, but their
implementations were exactly the same (and I don't see a reason why they
would need to diverge).
Release Notes:
- N/A
This PR adds a new `prompt_library` crate and extracts the `PromptStore`
and `PromptBuilder` to it.
Eventually we'll want to house the `PromptLibrary` itself in this crate,
but right now that involves untangling a few dependencies.
Release Notes:
- N/A
Builds on https://github.com/zed-industries/zed/pull/22160 and extracts
the rest of `PromptEditor` so it can be shared across terminal and
inline assistants. This will help avoid the UI drifting as we have
already observed.
Note: This is mostly a mechanical refactor. I imagine some things could
be factored in a better way by someone with more context, but I think
this is a good start.
Release Notes:
- N/A
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Co-authored-by: Richard Feldman <oss@rtfeldman.com>