Adds support for a configurable path where ssh network info statsare going to be saved.

Remnant from the ssh background connection support

This patch provides UI support for the network inf dir wheressh metrics will be saved. Users can configure the defaultlocation for this place.

Also, the default directory is renamed to ssh-network-metricsfor a better description.

Toolbox spawns a native process running the SSH client. The ssh client then spawnsanother process which associated to the coder proxy command. SSH network metricsare saved into json file with the name equal to the pid of the ssh command (notto be confused with the proxy command's name)

When ssh is connected a poll job is created that searches for theSSH command pid, and then determines the network metrics json file.The pid can change multiple times in a Toolbox session, especiallywhen the OS goes to sleep and comes back - the ssh is respawned.This is the reason we don't cache the pid, instead always searchfor it.The poll job activates every 5 settings and it is cancelled whenthe user stops the ssh connection.

This commit contains the data class necessary tounmarshall the ssh network metrics and also thenecessary moshi plumbing for converting the json file.

Under the "Additional environment information". Unfortunately it was notpossible any other way. The description property is modifiable howeverToolbox renders the description label only as long as the SSH connectionis not established. As soon as an ssh connection is running the descriptionlabel is used as mechanism to notify users about available IDE updates.It also appears that we can't have any other extra tab, other than "Tools","Projects" and "Settings". There is a secondary information attribute API,but it is not usable to show recurring metrics info because it can only beconfigured once, it is not a mutable field.The best effort was to add the information in the Settings page, and it isworth highlighting that the metrics are only refreshed when user either:- switches between tabs- expands/collapses teh "Additional environment information" section.There is no programmatic mechanism to notify the information in the Settingspage changed

Discarded the download/upload stats, changed the text status, and I'veadded support for Coder Connect.UTs covering the status generation were also added.