[Feature]: Add HAR packet dump support

[jonbarrow]

Checked Existing

• I have checked the repository for duplicate issues.

What feature do you want to see added?

Add the ability to load HAR dumps into the viewer and display their (relevant) contents.

Why do you want to have this feature?

HAR is a standard format for storing HTTP traffic. Every major proxy tool has the ability to produce HAR dumps of the captured HTTP traffic, making it relatively platform agnostic. Currently this would only be useful for displaying HPP packets, which are sent over HTTP rather than PRUDP.

Any other details to share? (OPTIONAL)

It's possible that HAR support could eventually be used for PRUDPLite traffic, however there is no known tool which can correctly dump usable WebSocket messages into HAR dumps.