`json_replace` should accept number value as json

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

### 2. What did you expect to see? (Required)

```
mysql> SELECT json_replace(123, '$', 456);
ERROR 3146 (22032): Invalid data type for JSON data in argument 1 to function json_replace; a JSON string or JSON type is required.
```

### 3. What did you see instead (Required)

```
mysql> SELECT json_replace(123, '$', 456);
+-----------------------------+
| json_replace(123, '$', 456) |
+-----------------------------+
| 456 |
+-----------------------------+
1 row in set (0.00 sec)
```

### 4. What is your TiDB version? (Required)