[Feat]: Allow User to remove spaces b/w Canvas and Components through frontend option

[adnanqaops]

Is your feature request related to a problem? Please describe.

Currently, we can't remove the spaces b/w the Lowcoder Canvas and the components inside it. This causes a bad UI/UX on Public site. User has to write the Custom CSS for removing the space.

Describe the solution you'd like

• Set Padding for the Canvas
• Set Background Color (individually from a Theme)
• Set Background Image
• Set Background Image Repeat, Position
• Set CSS Gradient via Background Image
• Set Background Video
• Set Background Animation (Lottie)

Not only this, But also:

• Set Aspect Ratio, so the amount of vertical Grid Cells is calculated
• Set "Max Height" for the canvas (alternative to Aspect Ratio)
• This new settings here count for the standard App Canvas, but also for the Canvas, which is displayed to show apps inside of both Navigation App Types.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.