feat(bruno): add grant cancellation request (#3458)

Author: BlairCurrey

bruno/collections/Rafiki/Open Payments Auth APIs/Grants/Grant Cancel.bru

@@ -0,0 +1,21 @@
+meta {
+  name: Grant Cancel
+  type: http
+  seq: 3
+}
+
+delete {
+  url: {{continueUri}}
+  body: none
+  auth: none
+}
+
+headers {
+  Authorization: GNAP {{continueToken}}
+}
+
+script:pre-request {
+  const scripts = require('./scripts');
+  
+  await scripts.addSignatureHeaders();
+}

bruno/collections/Rafiki/Open Payments Auth APIs/Grants/Grant Request.bru

@@ -66,4 +66,12 @@ script:post-response {
   const scripts = require('./scripts');
 
   scripts.storeTokenDetails();
+  
+  // save continue uri
+  const responseJson = res.body;
+  if (res?.body?.continue?.uri) {
+    bru.setEnvVar('continueUri', res.body.continue.uri);
+  } else {
+    console.warn('continue.uri not found in response');
+  }
 }