Describe the improvement

When starting a local run, there are lots of printouts from both cargo-shuttle and the runtime's startup logic.

A -q / --quiet flag can be added to the run command, that supresses non-error prints in cargo-shuttle. The flag can also be passed on as --quiet to the runtime binary, where it can also be used to supress the lines that are usually printed (the ones that show up with [Runtime] prepended).

A solution that puts the relevant prints inside if-statements should be sufficient.

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