Ability to export as HTTP archive (.har) format

[mitchins]

Is your feature request related to a problem? Please describe.
It would be more convenient and have less learning curve if a standard format like HTTP Archive (.har) was used when sharing logs. There are many tools across Windows, Mac and Linux that support it.. e.g. Charles Proxy.

Describe the solution you'd like
Ability to choose .har (HTTP archive) when exporting logs

Describe alternatives you've considered
While it's possible to export as-is and convert, this will lower the barrier for people already using other tools or not developers themselves.

Additional context
I would be happy to look into creating a PR, as the HAR format isn't overly complicated.. but wanted to get a consensus first.