Debug: Add DEBUG Timestamps

[maschad]

Would like to have the option to prepend [YYYY/MM/DD - HH:mm:ss] to all debug output lines by passing in an environment variable timestamps=true to enable them or by setting this in localstorage

Originally libp2p/js-libp2p-logger#33

[tabcat]

It looks like this is already available in debug https://github.com/debug-js/debug#environment-variables. Although the date format is slightly different.

[maschad]

That's why I had opened this issue, it's actually been discussed on debug-js but there is still an ongoing discussion on how to format output, but this exact format is desired for our library.

[achingbrain]

Closing as this is configurable via env vars as pointed out above and any extra work would not be carried out in this repo.

[2color]

Reopened this since this isn't actually configurable via env vars. The DEBUG_HIDE_DATE is a no-op it seems.

But either way, this should probably be fixed in the debug repo.