fix(node): feed in our API key and options to the process end flush (#1284)

## 🧰 Changes

This fixes an issue in the Node SDK where when we call
`process.on('exit')` to flush the log queue when the process ends we
aren't feeding an API key or SDK options into the `doSend()` call,
resulting in the SDK crashing the server it's being run in:

```
[server] /Users/username/Documents/GitHub/readme/node_modules/readmeio/dist/src/lib/metrics-log.js:85
[server]     if (options.fireAndForget) {
[server]                 ^
[server] 
[server] TypeError: Cannot read properties of undefined (reading 'fireAndForget')
[server]     at metricsAPICall (/Users/username/Documents/GitHub/readme/node_modules/readmeio/src/lib/metrics-log.ts:134:15)
[server]     at process.doSend (/Users/username/Documents/GitHub/readme/node_modules/readmeio/src/lib/log.ts:28:17)
[server]     at process.emit (node:events:531:35)
[server]     at process.emit (node:domain:489:12)
[server]     at process.emit.sharedData.processEmitHook.installedValue [as emit] (/Users/username/Documents/GitHub/readme/node_modules/@cspotcode/source-map-support/source-map-support.js:745:40)
[server]     at process.exit (node:internal/process/per_thread:240:15)
[server]     at process.emit.sharedData.processEmitHook.installedValue [as emit] (/Users/username/Documents/GitHub/readme/node_modules/@cspotcode/source-map-support/source-map-support.js:750:17)
[server]     at process._fatalException (node:internal/process/execution:155:25)
[server] 
[server] Node.js v22.21.0
[server] [nodemon] app crashed - waiting for file changes before starting...
```

Author: erunion

packages/node/src/lib/log.ts

@@ -17,6 +17,8 @@ import { metricsAPICall } from './metrics-log';
 import { patchRequest } from './patch-request';
 import { patchResponse } from './patch-response';
 
+let sdkAPIKey: string;
+let sdkOptions: Options;
 let queue: OutgoingLogBody[] = [];
 function doSend(readmeApiKey: string, options: Options) {
   // Copy the queue so we can send all the requests in one batch
@@ -34,8 +36,14 @@ function doSend(readmeApiKey: string, options: Options) {
 
   logger.debug({ message: 'Queue flushed.', args: { queue } });
 }
+
 // Make sure we flush the queue if the process is exited
-process.on('exit', doSend);
+process.on('exit', () => {
+  if (sdkAPIKey && sdkOptions) {
+    return doSend(sdkAPIKey, sdkOptions);
+  }
+  return;
+});
 
 /* eslint-disable typescript-sort-keys/interface */
 export interface ExtendedIncomingMessage extends IncomingMessage {
@@ -117,6 +125,11 @@ export function log(
     else logger.configure({ isLoggingEnabled: true, strategy: options.logger });
   }
 
+  if (!sdkAPIKey || !sdkOptions) {
+    sdkAPIKey = readmeApiKey;
+    sdkOptions = options;
+  }
+
   // Ensures the buffer length is between 1 and 30
   const bufferLength = clamp(options.bufferLength || config.bufferLength, 1, 30);