feat(core): Make TranslatePipe and TranslateDirective standalone

[krtek4]

Make the TranslatePipe and TranslateDirective standalone so only those can be imported in a standalone component instead of the whole module.

[tarp-jusf]

Seeing as the Angular docs clearly state the following, there is no reason not to implement this change ASAP. It will literally not break anything.

You can import a standalone component (or directive, or pipe) just like you would an [NgModule](https://angular.io/api/core/NgModule) - using [NgModule.imports](https://angular.io/api/core/NgModule#imports):
Source: Standalone Components - Using standalone components in NgModule-based applications