chore: rename @vben-core -> @core

packages/@core/shared/toolkit/src/index.ts

@@ -0,0 +1,11 @@
+export * from './color';
+export * from './date';
+export * from './diff';
+export * from './hash';
+export * from './inference';
+export * from './letter';
+export * from './merge';
+export * from './namespace';
+export * from './nprogress';
+export * from './tree';
+export * from './window';