Lincoln Stein 5a4765046e add logging support
This commit adds invokeai.backend.util.logging, which provides support
for formatted console and logfile messages that follow the status
reporting conventions of earlier InvokeAI versions.

Examples:

   ### A critical error     (logging.CRITICAL)
   *** A non-fatal error    (logging.ERROR)
   ** A warning             (logging.WARNING)
   >> Informational message (logging.INFO)
      | Debugging message   (logging.DEBUG)
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