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This introduces a new package `src/synthetic` for generating synthetic data, currently primarily for benchmarking but other use cases can emerge. The synthetic package exports a runtime-dispatched type `Generator` that can generate data of various types. To start, we have a bytes, utf8, and OSC generator. The goal of each generator is to expose knobs to tune the probabilities of various outcomes. For example, the UTF-8 generator has a knob to tune the probability of generating 1, 2, 3, or 4-byte UTF-8 sequences. Ultimately, the goal is to be able to collect probability data empirically that we can then use for benchmarks so we can optimize various parts of the codebase on real-world data shape distributions.