Refactor Table theme surface to use semantic themeProps spread

[akoweicollinxx]

This change updates the Table theming surface to match Astryx’s semantic theming conventions.

What changed
Adds semantic Table theme keys:
table
table-row
table-cell
table-header-cell
Preserves existing legacy Table selector aliases so current themes continue to work
Updates Table documentation to show the semantic keys instead of only raw class names
Adds tests to verify both the semantic and legacy theming surfaces resolve correctly
Why
The Table component was the outlier in the theming system: its override targets were exposed as raw class names instead of semantic component keys. This makes Table harder to discover and inconsistent with the rest of the design system.

Compatibility
This is backwards compatible. Existing themes that target the legacy Table selectors should continue to work, while new themes can use the semantic keys.

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