Add hoverForeground and hoverBackground to activity bars

[alexa-acosta]

This PR adds new settings for customizing the hover foreground and background
colors for both the Activity Bar and Activity Bar Top in VSCode:

• activityBar.hoverForeground
• activityBar.hoverBackground
• activityBarTop.hoverForeground
• activityBarTop.hoverBackground

These settings allow users to avoid color clashes when hovering over items.

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