Run any Jupyter kernel in Zed on any buffer (editor):
<img width="1074" alt="image"
src="https://github.com/zed-industries/zed/assets/836375/eac8ed69-d02b-4d46-b379-6186d8f59470">
## TODO
### Lifecycle
* [x] Launch kernels on demand
* [x] Wait for kernel to be started
* [x] Request Kernel info on start
* [x] Show in progress indicator
* [ ] Allow picking kernel (it defaults to first matching language name)
* [ ] Menu for interrupting and shutting down the kernel
* [ ] Drop running kernels once editor is dropped
### Media Outputs
* [x] Render text and tracebacks with ANSI color handling
* [x] Render markdown as text
* [x] Render PNG and JPEG images using an explicit height based on
line-height
* ~~Render SVG~~ -- not happening for this PR due to lack of text in SVG
support
* [ ] Process `update_display_data` message and related `display_id`
* [x] Process `page` data from payloads as outputs
* [ ] Render markdown as, well, rendered markdown -- Note: unsure if we
can get line heights here
### Document
* [x] Select code and run
* [x] Run current line
* [x] Clear previous overlapping runs
* [ ] Support running markdown code blocks
* [ ] Action to export session as notebook or output files
* [ ] Action to clear all outputs
* [ ] Delete outputs when lines are deleted
## Other missing features
The following is a list of missing functionality or expectations that
are out of scope for this PR.
### Python Environments
Detecting python environments should probably be done in a separate PR
in tandem with how they're used with LSP. Users likely want to pick an
environment for their project, whether a virtualenv, conda env, pyenv,
poetry backed virtualenv, or the system. Related issues:
* https://github.com/zed-industries/zed/issues/7646
* https://github.com/zed-industries/zed/issues/7808
* https://github.com/zed-industries/zed/issues/7296
### LSP Integration
* Submit `complete_request` messages for completions to interleave
interactive variables with LSP
* LSP for IPython semantics (`%%timeit`, `!ls`, `get_ipython`, etc.)
## Future release notes
- Run code in any editor, whether it's a script or a markdown document
Release Notes:
- N/A
