[dev] add command line interface for common utility functions

[Rhett-Ying]

🔨Work Item

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Project tracker: https://github.com/orgs/dmlc/projects/2

Description

For example, when we want to convert DGL partitions into GraphBolt formats, we are required to call like:

python -c "import dgl;dgl.distributed.dgl_partition_to_graphbolt(${DGL_INPUT}, store_eids=True, graph_formats=['coo', 'csc'])"

But when we run such command on AWS batch jobs, it's not easy to escape string properly. A desired way is like:

python -m dgl.distributed.dgl_partition_to_graphbolt --input-path /mount/data/metadata.json --graph-formats coo,csc

Depending work items or issues