Single-object viewer POC (#14)

This commit implements a Sketchfab-style single-object viewer as a minimal
proof-of-concept.

### `@storyteller/studio-web`
This is a new package to house web components for interfacing with the
`@storyteller/studio` WASM library. It currently includes a single component,
`<sts-viewer />`, which is exported from `@storyteller/studio-web/viewer`.

### `react-frontend`
This is a new application intended as a proof-of-concept and testbed for React
interop with `@storyteller/studio-web`.

Web components are currently a little bit fiddly to use in a React application.
`react-frontend/src/app/studio-viewer.tsx` demonstrates how a React-idiomatic
component can be written as a thin wrapper around a web component, and
`react-frontend/src/app/app.tsx` demonstrates that wrapper component in use.

studio/assets/gltf/couch.gltf

@@ -0,0 +1,172 @@
+{
+	"asset":{
+		"generator":"Khronos glTF Blender I/O v3.6.27",
+		"version":"2.0"
+	},
+	"scene":0,
+	"scenes":[
+		{
+			"name":"Scene",
+			"nodes":[
+				0
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+		}
+	],
+	"nodes":[
+		{
+			"mesh":0,
+			"name":"Couch"
+		}
+	],
+	"materials":[
+		{
+			"name":"Archisketch_122724_Frame_Yellow",
+			"normalTexture":{
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+				"baseColorTexture":{
+					"index":1
+				},
+				"metallicRoughnessTexture":{
+					"index":2
+				}
+			}
+		}
+	],
+	"meshes":[
+		{
+			"name":"Couch",
+			"primitives":[
+				{
+					"attributes":{
+						"COLOR_0":0,
+						"POSITION":1,
+						"NORMAL":2,
+						"TEXCOORD_0":3
+					},
+					"indices":4,
+					"material":0
+				}
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+	],
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+			"mimeType":"image/png",
+			"name":"archisketch_122724_frame_yellow_normal",
+			"uri":"../textures/archisketch_122724_frame_yellow_normal.png"
+		},
+		{
+			"mimeType":"image/png",
+			"name":"archisketch_122724_frame_yellow_basecolor",
+			"uri":"../textures/archisketch_122724_frame_yellow_basecolor.png"
+		},
+		{
+			"mimeType":"image/png",
+			"name":"archisketch_122724_frame_yellow_occlusionroughnessmetallic",
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+			"uri":"couch.bin"
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+}