[dev] add command line interface for common utility functions

## 🔨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