Add Tracker URL Overwrite

[lucca180]

Allows you to create a custom function to overwrite a URL before is sent to Unami.
Kinda solves #2979

Works this way:

Define your overwrite function at the window scope:

<script>
function myPathOverwriter(path) {
    if (path.startsWith("/pt")) path = path.replace("/pt", "");
    return path;
 }
</script>

and when loading unami, pass your function name using the data-url-overwrite param

<script
  defer
  src="http://mywebsite.com/umami.js"
  data-website-id="94db1cb1-74f4-4a40-ad6c-962362670409"
  data-url-overwrite="myPathOverwriter"
></script>

If your function returns empty or undefined, the original path will be used.

[vercel]

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[greptile-apps]

PR Summary

This PR adds URL overwriting functionality to the Umami tracker, allowing users to modify or redact sensitive data from URLs before they are sent to the analytics server.

• Added urlOverwrite attribute in src/tracker/index.js to specify a custom URL transformation function
• Modified parseURL() to check for and execute the custom overwrite function before returning the final URL
• Maintains original URL if overwrite function returns empty/undefined or isn't defined
• Implementation integrates cleanly with existing URL parsing logic without breaking changes
• Addresses issue Data redaction before sending to server #2979 by providing a way to redact sensitive data from tracked URLs

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[greptile-apps]

logic: potential security risk - executing arbitrary functions from window scope without validation could allow XSS if the attribute value is user-controlled