[plasma-store] publish to crates.io

[irakliyk]

This PR will prepare plasma-store crate for publishing to crates.io. I believe the tasks are:

• Add rust-style comments to describe the crate
• Generate documentation
• Get credentials for publishing

Anything else?

[kevinlewi]

A nice-to-have but not a requirement: take a look at this publish script which will sync github releases with publishing to crates.io: https://github.com/novifinancial/opaque-ke/blob/master/.github/workflows/publish.yml

Also, in terms of directory structure, any reason why we still need to maintain the plasma-store/ directory instead of just collapsing its contents into the root directory? (i.e. can we get rid of the workspace singleton and just put the src/ folder along side the LICENSE, README.md. etc?)

[irakliyk]

Thank you! I'll add the publish script.

As for directory structure, I'm planning to add another crate for plasma-stream here, and maybe more crates in the future if we need to add any functionality which doesn't fit into these two crates.

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