fix: Configure max backoff and jitter ratio to ensure exponential backoff. (#463)

Without these set the event source retries every second, which is not
the desired behavior.

Author: kinyoklion

packages/sdk/server-node/src/platform/NodeRequests.ts

@@ -152,6 +152,8 @@ export default class NodeRequests implements platform.Requests {
       ...eventSourceInitDict,
       agent: this.agent,
       tlsParams: this.tlsOptions,
+      maxBackoffMillis: 30 * 1000,
+      jitterRatio: 0.5,
     };
     return new LDEventSource(url, expandedOptions);
   }