Capture error codes and additional fields in payload addons

[Copilot]

Error payloads now only contained error.name and error.message. Node.js errors carry additional diagnostic fields like error codes (ERR_INVALID_ARG_TYPE), SystemError fields (path, errno, syscall), and custom properties that are lost.

Changes

src/modules/event.ts

• Added getAddons() to extract all error properties except name, message, stack
• Added isSerializable() to filter non-JSON-serializable values (functions, symbols, circular refs)

src/index.ts

• Include addons in payload when additional error properties exist

Example

// SystemError now includes diagnostic fields
try {
  fs.readFileSync('/nonexistent/path');
} catch (error) {
  HawkCatcher.send(error);
  // Payload now includes:
  // addons: {
  //   code: "ENOENT",
  //   errno: -2,
  //   syscall: "open",
  //   path: "/nonexistent/path"
  // }
}

// Custom error properties are captured
const err = new Error('DB connection failed');
err.code = 'DB_CONNECTION_ERROR';
err.retryable = true;
HawkCatcher.send(err);
// Payload includes: addons: { code: "DB_CONNECTION_ERROR", retryable: true }

Sensitive data filtering via beforeSend hook remains available.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Provide more detailed error in payload</issue_title>
<issue_description>Now only error.message and error.name got sent.

Need to include:

• Error codes
• additional fields of error, like in SystemError (path, info, errno, etc)
• comply to existing schema</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Provide more detailed error in payload #4

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