Theme API in JavaScript Image Editor API control

• An enum representing the available themes in the image editor.
• Bootstrap - The Bootstrap theme.
• Bootstrap4 - The Bootstrap 4 theme.
• Bootstrap5 - The Bootstrap 5 theme.
• Bootstrap5Dark - The dark variant of the Bootstrap 5 theme.
• BootstrapDark - The dark variant of the Bootstrap theme.
• Fabric - The Fabric theme.
• FabricDark - The dark variant of the Fabric theme.
• Fluent - The Fluent UI theme.
• Fluent2 - The Fluent 2.0 UI theme.
• Fluent2Dark - The dark variant of the Fluent 2.0 UI theme.
• FluentDark - The dark variant of the Fluent UI theme.
• Highcontrast - The high contrast theme.
• Material - The Material Design theme.
• MaterialDark - The dark variant of the Material Design theme.
• Tailwind - The Tailwind CSS theme.
• TailwindDark - The dark variant of the Tailwind CSS theme.