feat: add support for multi-themes (#210)

* chore: update deps

* wip

* add themes

* add matrix theme

* add flexoki and spaceduck themes

* .

* simple theme change function

* .

* respect shadow and radius settings

* add rose pine themes

* toggle theme

crates/theme/Cargo.toml

@@ -8,3 +8,10 @@ publish.workspace = true
 gpui.workspace = true
 anyhow.workspace = true
 log.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+schemars.workspace = true
+smallvec.workspace = true
+
+[dev-dependencies]
+tempfile = "3.10"