Make mimirtool not use color when pointed to non-tty output

[yedayak]

Is your feature request related to a problem? Please describe.

Currently when running for example mimirtool rules print | less or mimirtool rules print > rules.yaml, it outputs ansi color codes, which show up in the output and make the yaml not valid. This happens always, unless you use the --disable-color option. Using the --disable-color works ok if you know about it already and for scripts, but anyone using the tool interactively has to remember to use it when piping to a pager or a parser like yq.

Describe the solution you'd like

Detect when the output is redirected to anything other than a terminal, and don't print color codes in those cases.

Describe alternatives you've considered

Additional context

Detecting if printing to a tty is a common pattern with other CLI tools, for example jq or tree. Having the default option being auto, and than allowing forcing color or disabling it is reasonable solution IMO.