feat: A new --quiet flag to suppress noisy output in scripting scenarios

[artob]

Improves #437

@race-of-sloths include

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Current status: executed

Reviewer	Score
@frol	3

Your contribution is much appreciated with a final score of 3!
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[frol]

@artob Thank you for the contribution! I think this is not enough, and @FroVolod is actually working on the full solution that also handles tracing logs, loader indicators, and interactive prompts.

Have you considered sending stderr to the /dev/null? 2>/dev/null? We tried to use eprintln! for human messages and println! only for the command results.

[artob]

@frol Don't let the perfect be the enemy of the good. This PR is meant as the quickest and simplest possible thing that already cuts out the most annoying thing from the scripting experience and can then be further iterated upon.

[frol]

@race-of-sloths score 3