[RFC] Partitioning for a given backend

[mseth10]

Description

Request for comments for the next PR on partitioning for a given backend

• Printing graph statistics after call to optimize_for
• Documentation: adding a markdown file with description and example(s)
• Updating lib_subgraph examples to add ones using gluon

References

• Recent related PRs: Partitioning Gluon HybridBlocks #15969 Graph Partition API #15886

[szha]

This feature has been merged and will be included as part of the mxnet 2.0. Thank you @mseth10