Bring Jupyter to Zed Editing (#12062)

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

crates/repl/Cargo.toml

@@ -0,0 +1,49 @@
+[package]
+name = "repl"
+version = "0.1.0"
+edition = "2021"
+publish = false
+license = "GPL-3.0-or-later"
+
+[lints]
+workspace = true
+
+[lib]
+path = "src/repl.rs"
+doctest = false
+
+[dependencies]
+anyhow.workspace = true
+alacritty_terminal.workspace = true
+async-dispatcher.workspace = true
+base64.workspace = true
+collections.workspace = true
+editor.workspace = true
+gpui.workspace = true
+futures.workspace = true
+image.workspace = true
+language.workspace = true
+log.workspace = true
+project.workspace = true
+runtimelib.workspace = true
+schemars.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+settings.workspace = true
+smol.workspace = true
+theme.workspace = true
+terminal_view.workspace = true
+ui.workspace = true
+uuid.workspace = true
+workspace.workspace = true
+
+[dev-dependencies]
+editor = { workspace = true, features = ["test-support"] }
+env_logger.workspace = true
+gpui = { workspace = true, features = ["test-support"] }
+language = { workspace = true, features = ["test-support"] }
+project = { workspace = true, features = ["test-support"] }
+settings = { workspace = true, features = ["test-support"] }
+theme = { workspace = true, features = ["test-support"] }
+util = { workspace = true, features = ["test-support"] }
+http = { workspace = true, features = ["test-support"] }