Use ComponentResourceKey instead of strings to identify resources

[MovGP0]

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

• Currently resources are identified using strings. The string can only be validated at runtime and not while writing the XAML code
• When a resource key changes in a new version, the compiler does not indicate a problem and we get an Exception at runtime

Describe the solution you'd like

• Using ComponentResourceKey would make resources type-save
• Optional: preserve the existing string-based resource keys for backward-compatibility, or increase the version number because of breaking changes

Describe alternatives you've considered

• Don't know a better way

Additional context
To create the resource key, you need to create a Component resource key in a static class:

public static partial class MaterialDesignColors
{
    public static ComponentResourceKey Primary50Color { get; } = new(typeof(MaterialDesignColors), nameof(Primary50Color));
    // ...
}

When declaring the resource in the ResouceDictionary, use the ComponentResourceKey as Key:

<Color Key="{x:Static md:MaterialDesignColors.Primary50Color}" ... />

When using the resource, we can now use a static reference that is checked by the compiler:

<Brush Color="{DynamicResource {x:Static md:MaterialDesignColors.Primary50Color}}" ... />