feat(@clack/prompts): configurable colors

[hazycora]

A partial implementation of #36.

I'm sure the maintainers likely have their own ideas for how this could work instead. I've made this for my own use until #36 is resolved, but just on the off-chance my approach is okay with the maintainers here I thought I'd try submitting it as a PR. Fully understand if this approach isn't preferred :) It's highly customisable to an extent that could be seen as unnecessary, lol.

Colors for specific contexts are defined in a config.colors exported object, which users of the library can edit. If, for instance, you wanted to replace all uses of green in the default theme with magenta, you could do this:

import * as p from '@clack/prompts'

p.config.colors.symbol.submit = 'magenta'
p.config.colors.log.success = 'magenta'
p.config.colors.log.step = 'magenta'
p.config.colors.radio.active = 'magenta'
p.config.colors.checkbox.selected = 'magenta'
p.config.colors.key.active = ['inverse', 'bgMagenta', 'gray']

I've used a config object instead of just having an object for the colors themselves, in case more was configurable in the future, like the symbols used for various things.

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