Fix Divider component color prop name and values

[PelayoFelgueroso]

Describe the bug
The Divider component accepts the following values for the color prop: lightGrey | mediumGrey | darkGrey.

However, the resulting color is not always grey, since it relies on the neutral color token. It will usually be a shade of grey, but not necessarily.

Expected behaviour
The accepted prop values should not include the word “grey” or any specific color name. Consider renaming the prop to color-weight and allowing only: light | medium | dark.

Screenshots
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Code Page

Usage inside the component

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DxcDivider

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