Add network track support to the Chrome importer

It would be helpful if the Chrome importer mapped network requests to network tracks in the Firefox profiler.

For example, when loading the following Chrome Performance trace in the Chrome performance panel, we can see how Chrome scheduled and executed the network requests:
[Chrome-login.yahoo.com Trace-20250122T160410.json](https://github.com/user-attachments/files/18523102/Chrome-login.yahoo.com.Trace-20250122T160410.json)

However when we import this into the Firefox profiler, the network requests appear to be dropped:
https://share.firefox.dev/4h9GpsK

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-872)