Merge `GetProps` and `ScanVertices`/`ScanEdges` RPC.

[Shylock-Hg]

Introduction

Merge GetProps and ScanVertices/ScanEdges into one RPC. Because they should behaviors same except ScanVertices and ScanEdges get vertex/edge id by scan storage but GetProps get vertex/edge id from input.

1. So there are much same code in their implementation, combine to one will reduce these.
2. Combine to one will guarantee behavioring same more. And easier to maintain.

Contents

The combined RPC named GeProps, with given vertex/edge id it behaviors as origin GetProps, without it behaviors as ScanVertices and ScanEdges.

But maybe lead to more complex to plan analysis. Or we don't merge the related plan node/executor.

Related work