feat(plugins): add theme palette switcher

[SupianIDz]

This PR adds the Filament Palette plugin to the Filament plugins directory.

Plugin Details

• Name: Palette Switcher
• Repository: https://github.com/OctopyID/FilamentPalette
• Packagist: https://packagist.org/packages/octopyid/filament-palette
• Version: 1.0.0
• Compatibility: Filament v3, v4 & v5

Context & Why this exists

Filament Palette provides a seamless way to switch and customize the UI color palette in Filament admin panels. It allows both per-user and global theme application, giving developers and end-users more control over the interface’s appearance.

Features

• User-specific themes: Each user can choose their preferred color palette.
• Global theme support: Apply a single theme across all users.
• Conditional visibility: Show or hide the palette switcher based on custom logic.
• Custom color palettes: Define or modify your own color schemes.
• Pre-built palettes: 9 beautiful ready-to-use palettes included.
• Easy integration: Minimal configuration required to get started.
• Flexible customization: Full control over theme application and visibility.

Documentation

Full usage instructions and configuration examples are available at: https://github.com/OctopyID/FilamentPalette#readme