[Bug][C++] VertexInfo IsValidated() return false when create with empty prefix

[acezen]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

as title describe

Expected Behavior

it should return true with a default prefix

Minimal Reproducible Example

auto vertex_info = CreateVertexInfo("person",  100, {pg})
assert (vertex_info->IsValidated() == false)

### Environment

- Operating system: ubuntu 22.04
- GraphAr version: v0.11.0


### Link to GraphAr Logs

_No response_

### Further Information

_No response_

[acezen]

as code
https://github.com/alibaba/GraphAr/blob/6a50e9ee287cdea96a59d210efc4dada2443ee5a/cpp/src/graph_info.cc#L171-L187
vertex info did not set a default prefix when pass prefix is empty.
it should make this action like edgeinfo:
https://github.com/alibaba/GraphAr/blob/6a50e9ee287cdea96a59d210efc4dada2443ee5a/cpp/src/graph_info.cc#L456-L459