[PM-17031] Create UI-common (#12831)

Extract core functionality from `libs/angular` to allow teams to depend on `libs/ui-common` instead.

Moves the following functionality to `ui-common`.
- `I18nPipe`. `libs/angular` still has an old copy but `components` depends on the new variant from `ui-common`.
- `safeProvider`, `SafeProvider` and `SafeInjectionToken`. `libs/angular`re-exports these to avoid needing to update all consumers.

libs/angular/src/platform/pipes/i18n.pipe.ts

@@ -2,6 +2,9 @@ import { Pipe, PipeTransform } from "@angular/core";
 
 import { I18nService } from "@bitwarden/common/platform/abstractions/i18n.service";
 
+/**
+ * @deprecated: Please use the I18nPipe from @bitwarden/ui-common
+ */
 @Pipe({
   name: "i18n",
 })