[API] Implement admin/add-emoji

src/server/api/endpoints/admin/add-emoji.ts

+import $ from 'cafy';
+import Emoji from '../../../../models/emoji';
+import define from '../../define';
+
+export const meta = {
+	desc: {
+		'ja-JP': 'カスタム絵文字を追加します。'
+	},
+
+	requireCredential: true,
+	requireAdmin: true,
+
+	params: {
+		name: {
+			validator: $.str
+		},
+
+		url: {
+			validator: $.str
+		},
+
+		aliases: {
+			validator: $.arr($.str).optional,
+			default: [] as string[]
+		}
+	}
+};
+
+export default define(meta, (ps) => new Promise(async (res, rej) => {
+	await Emoji.insert({
+		name: ps.name,
+		host: null,
+		aliases: ps.aliases,
+		url: ps.url
+	});
+
+	res();
+}));