Exports auth headers function (#37)

This PR exports the generateAuthHeaders function for external use.

### Background
[OPDATA-2540](https://smartcontract-it.atlassian.net/browse/OPDATA-2540)

### Testing
Ran unit tests via `npm test`

[OPDATA-2540]:
https://smartcontract-it.atlassian.net/browse/OPDATA-2540?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Author: mohamed-mehany

typescript/package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@chainlink/data-streams-sdk",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "description": "TypeScript SDK for Chainlink Data Streams",
   "main": "dist/src/index.js",
   "types": "dist/src/index.d.ts",

typescript/package.json

@@ -69,14 +69,16 @@ export { ConnectionStatus } from "./types/metrics";
 export * from "./types/errors";
 
 // Utility Functions
-export { 
-  // Report utilities 
-  getReportVersion, 
+export {
+  // Report utilities
+  getReportVersion,
   formatReport,
   // Time utilities
   getCurrentTimestamp,
+  // Authentication Headers
+  generateAuthHeaders,
 } from "./utils";
 
 // Constants
 export { DEFAULT_CONFIG } from "./defaultConfig";
-export { DEFAULT_TIMEOUT, DEFAULT_RETRY_ATTEMPTS, DEFAULT_RETRY_DELAY } from "./utils/constants";
+export { DEFAULT_TIMEOUT, DEFAULT_RETRY_ATTEMPTS, DEFAULT_RETRY_DELAY } from "./utils/constants";