feat: media silence (#13842)

* feat: media silence

* fix: lint

* feat: deny creating custom emoji reaction and using custom emoji from media silenced hosts

* chore: メディアサイレンスの説明にカスタム絵文字の話を追加

* Update locales/ja-JP.yml

Co-authored-by: Sayamame-beans <61457993+Sayamame-beans@users.noreply.github.com>

* chore: update index.d.ts

* docs(changelog): update changelog

---------

Co-authored-by: Sayamame-beans <61457993+Sayamame-beans@users.noreply.github.com>

packages/backend/src/core/UtilityService.ts

@@ -42,6 +42,12 @@ export class UtilityService {
 		return silencedHosts.some(x => `.${host.toLowerCase()}`.endsWith(`.${x}`));
 	}
 
+	@bindThis
+	public isMediaSilencedHost(silencedHosts: string[] | undefined, host: string | null): boolean {
+		if (!silencedHosts || host == null) return false;
+		return silencedHosts.some(x => host.toLowerCase() === x);
+	}
+
 	@bindThis
 	public concatNoteContentsForKeyWordCheck(content: {
 		cw?: string | null;