feat(common): allow default currency code to be configurable (#34771)

Default currency code in CurrencyPipe is currently hardcoded to USD
and is not configurable. This commit allows the default currency code
to be configurable by adding a DEFAULT_CURRENCY_CODE injection token.

Example:
```
providers: [{ provide: DEFAULT_CURRENCY_CODE, useValue: "GBP" }]
...
{{ 123.45 | currency }} // outputs £123.45 as opposed to always $123.45 before
```

Closes: #25461

PR Close #34771

tools/public_api_guard/common/common.d.ts

@@ -13,7 +13,7 @@ export declare class CommonModule {
 }
 
 export declare class CurrencyPipe implements PipeTransform {
-    constructor(_locale: string);
+    constructor(_locale: string, _defaultCurrencyCode?: string);
     transform(value: any, currencyCode?: string, display?: 'code' | 'symbol' | 'symbol-narrow' | string | boolean, digitsInfo?: string, locale?: string): string | null;
 }
 

tools/public_api_guard/core/core.d.ts

@@ -257,6 +257,8 @@ export declare const DebugNode: {
     new (...args: any[]): DebugNode;
 };
 
+export declare const DEFAULT_CURRENCY_CODE: InjectionToken<string>;
+
 /** @deprecated */
 export declare class DefaultIterableDiffer<V> implements IterableDiffer<V>, IterableChanges<V> {
     readonly collection: V[] | Iterable<V> | null;