fix(amis-core): autovar逻辑优化，执行resolveVariableAndFilter前先判断是否为表达式，减少性能损耗

packages/amis-core/src/SchemaRenderer.tsx

@@ -23,6 +23,7 @@ import {isAlive} from 'mobx-state-tree';
 import {reaction} from 'mobx';
 import {resolveVariableAndFilter} from './utils/tpl-builtin';
 import {buildStyle} from './utils/style';
+import {isExpression} from './utils/formula';
 import {StatusScopedProps} from './StatusScoped';
 import {evalExpression, filter} from './utils/tpl';
 
@@ -491,7 +492,7 @@ export class SchemaRenderer extends React.Component<SchemaRendererProps, any> {
     // 自动解析变量模式，主要是方便直接引入第三方组件库，无需为了支持变量封装一层
     if (renderer.autoVar) {
       for (const key of Object.keys(schema)) {
-        if (typeof props[key] === 'string') {
+        if (typeof props[key] === 'string' && isExpression(props[key])) {
           props[key] = resolveVariableAndFilter(
             props[key],
             props.data,