add chat emote response contract

contracts/v1/chat-emotes-response.json

@@ -0,0 +1,15 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "type": "array",
+  "maxItems": 50,
+  "items": {
+    "type": "object",
+    "additionalProperties": false,
+    "required": ["name", "url", "provider"],
+    "properties": {
+      "name": { "type": "string", "minLength": 1 },
+      "url": { "type": "string", "format": "uri", "pattern": "^https://" },
+      "provider": { "type": "string", "enum": ["twitch", "7tv"] }
+    }
+  }
+}

fixtures/v1/chat-emotes.response.json

@@ -0,0 +1,12 @@
+[
+  {
+    "name": "Kappa",
+    "url": "https://static-cdn.jtvnw.net/emoticons/v2/25/static/dark/2.0",
+    "provider": "twitch"
+  },
+  {
+    "name": "catJAM",
+    "url": "https://cdn.7tv.app/emote/60ae8f6f625f5a2a4d4e2b6f/2x.webp",
+    "provider": "7tv"
+  }
+]