feat: Implement feature to prevent screen shot with color

[fonkamloic]

Description

Implement a feature to prevent screenshots in Android and iOS. The screenshotBlockedWithColor(Colors.green) method takes in a single argument, which is the color.
When invoked, it will display the launch image while protecting the app's data from being captured in a screenshot. This helps ensure the security of sensitive information displayed in the app, such as personal information or financial data.
It's an easy and effective way to prevent data leakage by disabling screenshots in a specific part of the app and can be useful for apps that handle sensitive information.