add color customizations for inline debug values

[nrayburn-tech]

Modifies inline debug values to be allow color customizations/themes. Defaults should still be what they were previously, just converted to hex from rgba.

New color ids, debugInline.decorationBackground and debugInline.decorationForeground. The names may need to be changed to better align with the other ids.

Example of modified colors.

This PR fixes #120936

[isidorn]

@nrayburn-tech this is a great PR, and works nicely -> approved.

Let's just get @aeschli feedback on the color names. We are introducing:
debugInline.decorationBackground and debugInline.decorationForeground
What do you think about those?

fyi @weinand

[weinand]

@isidorn Looks good to me.

[isidorn]

After discussing with @aeschli we landed on the following names:
editor.inlineValuesBackground
editor.inlineValuesForeground

The biggest discussion was around if debug should be in the name or not. At the end we landed on NO because:

• there is inlineValueProvider in the VS Code API and it is in the language namespace. Thus it does not have to be connected to a debugging
• There is already stackFrameHighlight and focusedStackFrameHighlight colors which do not use the word debug

@nrayburn-tech can you please update the color names.
@weinand let me know if the names work for you

[isidorn]

Please just update color name

[nrayburn-tech]

@isidorn updated the names. I left the descriptions the same as I think debug is the only place that uses them, otherwise it could be more generalized like the name is. Let me know if you want anything else changed.

[isidorn]

Great, thanks a lot for updating the names. This PR looks good -> merging in ☀️ 👏