This change is a part of the component features rework which was made possible by the transition to TSX (since the templates themselves now bring the dependencies and the only responsibility of the features concept was dependency management, which is now obsolete for TSX-enabled components)

• features are now normal ES6 modules or just extra templates and each component manages them the way it sees fit - there is no longer a framework-enforced features concept, ComponentFeature base class or features registry
• Apps can still load the InputSuggestions.js module as before (nothing changed in this regard) and this will act as a "preload" and will simply skip the dynamic import in enableSuggestions later.
• But if an app does not bundle InputSuggestions.js, and still tries to set showSuggestions = true, there will no longer be a console warning, but it will work by dynamically importing the feature and using it.

Inside Input.ts the Suggestions property is now managed state, because we want it to be invalidating (when the dynamic import is ready, and this.Suggestions is set, the ui5-input must invalidate for the suggestions template to be rendered)

Additionally, deleted some leftover commented test code:

// declare module "@ui5/webcomponents-base/jsx-runtime" {
// 	// eslint-disable-next-line @typescript-eslint/no-namespace
// 	namespace JSX {
// 		interface IntrinsicElements {
// 			"ui5-input": Input["_jsxProps"];
// 		}
// 	}
// }