[MudColorProvider] -- updates to match changes in the material 3 specification

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https://m3.material.io/styles/color/the-color-system/tokens

[mckaragoz]

Can you describe the material changes (not need to all details) in here? It will be helpful for future PRs.

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This PR mainly adds the new definition(s) for Neutral colors from : https://m3.material.io/styles/color/the-color-system/key-colors-tones

• The neutral key color is used to derive surface color roles for backgrounds, as well as colors used for high emphasis text and icons.
• The neutral variant key color is used to derive color roles for medium emphasis elements like text, icons, and component outlines.

(light mode) Surface Dim - N-87 Surface - N-98 Surface Bright - N-98 Surface Container Lowest - N-100 Surface Container Low - N-96 Surface Container - N-94 Surface Container High - N-92 Surface Container Highest - N-90 On Surface - N-10 On Surface Variant - NV-30 Outline - NV-50 Outline Variant - NV-80

[mckaragoz]

Thanks 🥇