feat(server): ability to assign the base currency as api query when getting latest ex. rate

packages/server/src/system/models/TenantMetadata.ts

@@ -1,6 +1,8 @@
 import BaseModel from 'models/Model';
 
 export default class TenantMetadata extends BaseModel {
+  baseCurrency: string;
+
   /**
    * Table name.
    */