[logging] Use separate log for FlutterCommand

[helin24]

I added an option (default off) to record full file paths in logs. Originally I was thinking that we shouldn't record any file paths, but it seems reasonable to have them sometimes for debugging setup issues since these are recorded on a user's machine rather than to somewhere centralized that we receive by default.

[pq]

Cool! I wonder if this is something we should run by @anderdobo or @mit-mit? Do we need any extra messaging to make sure folks know not to have this enabled if filenames are sensitive and they're sharing logs with us?

[helin24]

Before this change we were logging these paths in idea.log, so this change is moving towards less sharing of filenames. I'm thinking for now we can mention if we're asking for logs, but in the future if we start attaching a log file to issues, we should do a check for the state of the setting.

[helin24]

But regardless, if any of you have opinions of what we can/should log in local files, please let me know. I started a doc on this but don't have much content at the moment.

[pq]

SGTM. Thanks!