chore(cli): remove decamelize pkg for compatiblity issues

packages/vant-cli/src/common/index.ts

@@ -1,4 +1,3 @@
-import decamelize from 'decamelize';
 import { join } from 'path';
 import { execSync } from 'child_process';
 import {
@@ -85,6 +84,13 @@ export function pascalize(str: string): string {
   );
 }
 
+export function decamelize(str: string, sep = '-') {
+  return str
+    .replace(/([a-z\d])([A-Z])/g, '$1' + sep + '$2')
+    .replace(/([A-Z]+)([A-Z][a-z\d]+)/g, '$1' + sep + '$2')
+    .toLowerCase();
+}
+
 export function getWebpackConfig(): object {
   if (existsSync(WEBPACK_CONFIG_FILE)) {
     const config = require(WEBPACK_CONFIG_FILE);
@@ -148,4 +154,4 @@ export function hasYarn() {
   return hasYarnCache;
 }
 
-export { decamelize, getVantConfig };
+export { getVantConfig };