fix: add get collection by ID endpoint

openapi.json

@@ -14,7 +14,7 @@
       "url": "http://www.apache.org/licenses/LICENSE-2.0"
     },
     "version": "2.0.0",
-    "x-box-commit-hash": "87c431c362"
+    "x-box-commit-hash": "98d60db47f"
   },
   "servers": [
     {
@@ -17807,6 +17807,51 @@
         ]
       }
     },
+    "/collections/{collection_id}": {
+      "get": {
+        "operationId": "get_collections_id",
+        "summary": "Get collection by ID",
+        "description": "Retrieves a collection by its ID.",
+        "parameters": [
+          {
+            "name": "collection_id",
+            "in": "path",
+            "description": "The ID of the collection.",
+            "required": true,
+            "schema": {
+              "type": "string"
+            },
+            "example": "926489"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Returns an array of items in the collection.",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/Collection"
+                }
+              }
+            }
+          },
+          "default": {
+            "description": "An unexpected client error.",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ClientError"
+                }
+              }
+            }
+          }
+        },
+        "x-box-tag": "collections",
+        "tags": [
+          "Collections"
+        ]
+      }
+    },
     "/recent_items": {
       "get": {
         "operationId": "get_recent_items",