Rust wrapper

[etwest]

A rust wrapper for splinterDB for using splinter in rust applications. Implements simple key/value operations using the default_data_config.

Wrapper based upon a previous version written by @rosenhouse.

Changes from the previous version of the wrapper:

• Automatic splinter binding (splinterdb-sys) generation when building the rust library
• More tests of the rust wrapper (splinterdb-rs)
• Support for new data_config layout and other changes to SplinterDB

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[etwest]

Closing pull request after joining VMware GitHub Organization. Will open a new one.