Replace CpsDialogConfig class with interface + InjectionToken to reduce bundle size

[lukasmatta]

Current state

CpsDialogConfig is a class used both as a type annotation and as an Angular DI token:

{ provide: CpsDialogConfig, useValue: config }

Because it's a DI token, it cannot be converted to an interface (interfaces are erased at compile time), so it emits unnecessary runtime JavaScript.

Proposed change

• Introduce a dedicated injection token:

export const CPS_DIALOG_CONFIG = new InjectionToken<CpsDialogConfig>('CPS_DIALOG_CONFIG');

• Convert CpsDialogConfig to an interface (zero runtime cost).
• Update internal usages to use CPS_DIALOG_CONFIG as the DI token.
• Deprecate the class-based token with a migration note for consumers (important).

Impact

• Reduces bundle size (class constructor is no longer emitted).
• Aligns with Angular best practices for config objects.
• Breaking change: consumers injecting CpsDialogConfig as a token need to migrate to CPS_DIALOG_CONFIG. Should be released in a major version bump.