NOSNOW add a global --color flag to disable colored output

[sfc-gh-boler]

When invoked with --color=off, the tool it no longer color its output, other formatting (bold, italics) remains unchanged.

We opt for a multi state option, so that it's extensible with other behaviours and themes.

Implementation wise, it seems the most robust way to disable colors is to set NO_COLOR env, which then works across all other libraries using rich.

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