feat: add timeout support to RequestContext and IsomorphicFetchHttpLibrary

Author: dahaque

src/gen/http/http.ts

@@ -0,0 +1,13 @@
+import { RequestContext, HttpMethod } from '../src/gen/http/http.ts';
+import { IsomorphicFetchHttpLibrary } from '../src/gen/http/isomorphic-fetch.ts';
+
+const http = new IsomorphicFetchHttpLibrary();
+
+// URL that delays response for 5 seconds
+const req = new RequestContext('https://httpbin.org/delay/5', HttpMethod.GET);
+req.setTimeout(2000); // 2s timeout
+
+http.send(req)
+    .toPromise?.()
+    .then(console.log)
+    .catch((err) => console.error('TIMED OUT:', err));