New version: DataGraphs v0.3.0

[JuliaRegistrator]

• Registering package: DataGraphs
• Repository: https://github.com/ITensor/DataGraphs.jl
• Created by: @mtfishman
• Version: v0.3.0
• Commit: 94155f99224be2312a52d533ff481de47b9b82f2
• Reviewed by: @mtfishman
• Reference: ITensor/DataGraphs.jl@94155f9#commitcomment-176620932
• Description: A simple graph type with data on the vertices and edges.
• Release notes:

## Breaking changes

- Better support for partitioned data graphs based on new interfaces in NamedGraphs.PartitionedGraphs.
- Overhaul the interface for customizing data access of data graphs and partitioned data graphs.

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