Use tracing instead of log crate #33
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Changed usubscription library to use generic tracing framework instead
of depending on env_logger crate. This allows users of the library
to choose their own logging backend.
Also updated up-subscription-cli to use tracing_subscriber as logging
backend and set up logging accordingly.
Removed obsolete None transport and related code and improved command
line argument handling for transport selection in up-subscription-cli.