Rework ConsoleHandler to use native console methods

[nesk]

Is your feature request related to a problem? Please describe.

When using the log module with Deno Deploy, the output is not "native" in the dashboard:

Describe the solution you'd like

Deno Deploy provides a clean UI for logs outputed with the debug, info, warn, error methods, what about using those by default in ConsoleHandler?

Describe alternatives you've considered

The ConsoleHandler can be useful but in a terminal, what about renaming it TerminalHandler and creating a new ConsoleHandler?

• TerminalHandler: always outputs with console.log and formats data by itself, like the current ConsoleHandler.
• ConsoleHandler: outputs with the appropriate console.* methods, lets Deno Deploy handle the formatting.

The only drawback I can see is the missing critical method in the native console API.