feat: send event mode data on a POST request with payload

[lucabenvenuto]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @lucabenvenuto, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the CMCD event data transmission mechanism to align with a POST-based approach. The change standardizes how CMCD event information is sent, ensuring that data is consistently delivered within the request body with the appropriate content type. This improves clarity and consistency in CMCD reporting.

Highlights

• CMCD Event Data Transmission: The method for sending CMCD event mode data has been updated to exclusively use POST requests, moving away from previous implementations that allowed headers or query parameters.
• Request Body Payload: CMCD data is now included directly in the body of the POST request, encoded as UTF-8, ensuring a standardized and explicit payload transmission.
• Content-Type Header: A Content-Type: 'text/cmcd' header is explicitly set for these POST requests, correctly identifying the nature of the data being sent.

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[gemini-code-assist]

Code Review

This pull request updates the CMCD manager to send event mode data, including response reporting, via POST requests with a payload. This change simplifies the out-of-band CMCD request mechanism by standardizing on POST for these types of requests. Please review the specific comments regarding parameter usage and JSDoc tags.