Add exponential backoff utility

source/errors.ts

@@ -0,0 +1,9 @@
+/**
+ * Error thrown when the maximum number of retries is hit in an exponential backoff
+ */
+export class ExponentialBackoffMaxRetriesHitError extends Error {
+    constructor() {
+        super('Exponential backoff: Max retries hit');
+        this.name = 'ExponentialBackoffMaxRetriesHitError';
+    }
+}