Support subgraph sampling for GNN

is there any plan in future to provide subgraph sampling support, our needs are as follows:
1.sample N neighbors for each node
2.subgraph sampling depth of K
3.subgraph contains vertices or edges properties

No files, tests, or entry points are identified in the issue. First clarify the intended GNN sampling API and integration point, including neighbor count, sampling depth, and vertex or edge properties; done should cover all three requested capabilities with agreed tests.

Written by the indexing model from the issue text.