Desktop: Make embedded resources optional (#3094)

* Make embedding resources optional

* Move remaining cef rc to internal module

* Move embedded resources to separate crate

* Review fixup

* Fix

* Fix read

* Add read error

Cargo.lock

@@ -2087,8 +2087,8 @@ dependencies = [
  "dirs",
  "futures",
  "glam",
+ "graphite-desktop-embedded-resources",
  "graphite-desktop-wrapper",
- "include_dir",
  "libc",
  "objc2-io-surface",
  "objc2-metal 0.3.1",
@@ -2104,6 +2104,13 @@ dependencies = [
  "winit",
 ]
 
+[[package]]
+name = "graphite-desktop-embedded-resources"
+version = "0.1.0"
+dependencies = [
+ "include_dir",
+]
+
 [[package]]
 name = "graphite-desktop-wrapper"
 version = "0.1.0"