[v0.12.2] Error when trying to create continuous query

**Describe the bug**

Today I wanted to create a continuous query, so I gave it a run. Already when running the first query I got from the documentation I got an error - and whatever I wrote, I got the same error:

```
Msg: 401: Error occurred while parsing SQL to physical plan: line 1:7 no viable alternative at input 'CREATE CONTINUOUS'
```

**To Reproduce**
Steps to reproduce the behavior:
1. Open a client to the iot-db
2. Run a query like `CREATE CONTINUOUS QUERY test BEGIN SELECT foo INTO test FROM root GROUP BY time(10s) END`
4. See error

**Expected behavior**

Create a continuous query of some kind ...

**Desktop (please complete the following information):**
- OS: Linux
- Browser n/a
- Version 0.12.2

**Additional context**

Here's a link to the documentation: https://iotdb.apache.org/UserGuide/Master/Advanced-Features/Continuous-Query.html

Start by checking the linked continuous-query documentation and reproducing the exact CREATE CONTINUOUS QUERY example against IoTDB 0.12.2. Determine whether that documented query is supported in the reported version; done means the example no longer produces the parser error or the supported syntax and version are clearly identified.

Written by the indexing model from the issue text.