[GIE] Start Cypher-only service

Now we have provided GIE service in Python SDK that supports starting Gremlin-only service using:
```
graphscope.gremlin(g)
```
or
```
graphscope.interactive(g, with_cypher=False) # False is the default option and can be omitted
```

and Gremlin/Cypher services using
```
graphscope.interactive(g, with_cypher=True)
```

We can add an api that starts Cypher-only service., like:
```
graphscope.cypher(g)
```