feat(http): add automatic rate limit handling with smartrequest

- Migrated HTTP client to @push.rocks/smartrequest for robust rate limiting
- Automatic retry with exponential backoff (1s, 2s, 4s) on HTTP 429
- Respects Retry-After headers from server
- Improved error handling and network resilience
- Updated documentation with rate limit handling examples

package.json

@@ -1,13 +1,13 @@
 {
   "name": "@apiclient.xyz/bunq",
-  "version": "4.2.1",
+  "version": "4.3.0",
   "private": false,
   "description": "A full-featured TypeScript/JavaScript client for the bunq API",
   "type": "module",
   "exports": {
     ".": "./dist_ts/index.js"
   },
-  "author": "Lossless GmbH",
+  "author": "Task Venture Capital GmbH",
   "license": "MIT",
   "scripts": {
     "test": "(tstest test/ --verbose --logfile --timeout 60)",
@@ -26,6 +26,7 @@
     "@push.rocks/smartfile": "^11.2.5",
     "@push.rocks/smartpath": "^6.0.0",
     "@push.rocks/smartpromise": "^4.2.3",
+    "@push.rocks/smartrequest": "^4.2.1",
     "@push.rocks/smarttime": "^4.0.54"
   },
   "files": [