Fix/rich progressbar visibility

[manascb1344]

What does this PR do?

Summary of Change:
This commit introduces a dynamic progress bar color based on the system's color theme. The progress bar will now adjust its color depending on whether the terminal supports color and if it's a truecolor terminal. For dark themes, the progress bar color is set to green, while for light themes, it is set to blue. The RichProgressBarTheme is updated to allow customization of color values for both light and dark themes.

Dependencies:

• The colored library is required for color support detection.

Fixes #17118

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📚 Documentation preview 📚: https://pytorch-lightning--19239.org.readthedocs.build/en/19239/

[manascb1344]

Hey @Borda and @awaelchli, noticed my PR #19239 acting up during checks. 🤔 Any insights on why it failed and advice on the necessary tweaks to make it pass? Thanks a bunch! 🙏

[awaelchli]

@manascb1344 We can't add a dependency to Lightning like this. The rich package is optional for Lightning. Is there a different way to detect the color?

The progress bar will now adjust its color depending on whether the terminal supports color and if it's a truecolor terminal.

Could you check whether this feature is already supported in rich itself? It feels like this is probably something that the package already handles, we just haven't configured it properly. I'm not familiar with this unfortunately.

[awaelchli]

Also, isn't purple suitable both for light and dark?

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