Button style enhancement

.changeset/angry-spoons-grin.md

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+---
+"@primer/react": patch
+---
+
+- Add a block prop for full width
+- Add alignContent prop to align content to center or start for full width buttons
+- Use control sizing CSS variable values (not using CSS vars just yet)
+- Use height over padding for more control over sizing
+- Adjust invisible button variant to match new design using ActionList colors
+