Mainline GPUI2 UI work (#3062)

This PR mainlines the current state of new GPUI2-based UI from the
`gpui2-ui` branch.

Release Notes:

- N/A

---------

Co-authored-by: Nate Butler <iamnbutler@gmail.com>
Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: Marshall Bowers <1486634+maxdeviant@users.noreply.github.com>
Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>
Co-authored-by: Nate <nate@zed.dev>
Co-authored-by: Mikayla <mikayla@zed.dev>

crates/storybook/Cargo.toml

@@ -11,7 +11,9 @@ path = "src/storybook.rs"
 [dependencies]
 anyhow.workspace = true
 clap = { version = "4.4", features = ["derive", "string"] }
+chrono = "0.4"
 gpui2 = { path = "../gpui2" }
+itertools = "0.11.0"
 log.workspace = true
 rust-embed.workspace = true
 serde.workspace = true