Crate ulid_rs

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Rewrites https://github.com/suyash/ulid from C++ to Rust

This exposes a single interface for Ulid creation

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Ulid::new(u64, Fn() -> u8)

Takes the last 48 bits of the passed timestamp and calls the passed closure 10 times for a random value.

In place of explicit MarshalBinary and UnmarshalBinary, implements Into<[u8; 16]>, Into<&[u8]>, Into<Vec<u8>>, From<[u8; 16]> and TryFrom<&[u8]>

Along with marshal that returns 26 UTF-8 words, TryInto<String>, TryInto<&str> and ToString are also implemented.

Along with unmarshal that works with AsRef<[u8]>, TryFrom<String> and TryFrom<&str> are also implemented.

Most benchmarks line up with similar performance from C++, with some showing improvements. Benchmarks are run on GitHub actions using criterion.

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