feat(terminal): add WebGL renderer and addon APIs

Cargo.toml

@@ -34,11 +34,14 @@ tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 validator = { version = "0.20", features = ["derive"] }
 vt100 = "0.15"
 heck = "0.5"
+unicode-segmentation = "1.13"
+unicode-width = "0.1"
 js-sys = "0.3"
 wasm-bindgen = "0.2"
 wasm-bindgen-futures = "0.4"
 web-sys = { version = "0.3", default-features = false, features = [
     "BinaryType",
+    "CanvasRenderingContext2d",
     "Clipboard",
     "ClipboardEvent",
     "CloseEvent",
@@ -52,6 +55,7 @@ web-sys = { version = "0.3", default-features = false, features = [
     "ErrorEvent",
     "Event",
     "EventTarget",
+    "HtmlCanvasElement",
     "HtmlElement",
     "InputEvent",
     "KeyboardEvent",
@@ -61,6 +65,12 @@ web-sys = { version = "0.3", default-features = false, features = [
     "Navigator",
     "ResizeObserver",
     "ResizeObserverEntry",
+    "WebGl2RenderingContext",
+    "WebGlBuffer",
+    "WebGlProgram",
+    "WebGlShader",
+    "WebGlTexture",
+    "WebGlUniformLocation",
     "WebSocket",
     "WheelEvent",
     "Window",