feat: Add 'data-debug' attribute to console log sent data

[codeBelt]

PR Summary

This PR introduces a new data-debug attribute to the tracking script tag. When data-debug="true" is present, the tracking script will output the sent data to the browser console for debugging purposes.

Example Usage

<script
  defer
  src="http://mywebsite.com/umami.js"
  data-debug="true"
></script>

[vercel]

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[greptile-apps]

Greptile Summary

This PR adds a new debugging feature to the Umami analytics tracking script by introducing a data-debug attribute. When this attribute is set to "true" on the script tag, the tracker will log all sent tracking data to the browser console, including the event type and payload information.

The implementation follows the established pattern used by other data attributes in the codebase. On line 27, the code extracts the debug attribute using the same attr() helper function used for other configuration options like data-auto-track and data-do-not-track. The debug functionality is then implemented in the send() function (lines 152-154) where it conditionally logs the tracking data before transmitting it to the server.

This feature integrates naturally with the existing tracker architecture, which already supports multiple data attributes for configuration. The debug logging occurs at the right point in the data flow - after the payload is constructed but before it's sent to the analytics endpoint, giving developers complete visibility into what data is being transmitted.

Confidence score: 3/5

• This PR introduces a potentially risky feature that could expose sensitive user data in production if accidentally left enabled
• The score reflects concerns about data privacy and security implications rather than code quality issues
• The src/tracker/index.js file needs careful attention to ensure the debug feature doesn't create security vulnerabilities

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