add shared-memory program #611
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There's no good way to return data to the caller of a cross-program invocation as per:
solana-labs/solana#12601
This PR adds a shared-memory program that takes a single account and writes the instruction data into the account's data starting an offset
Because of the simplicity of the program, the minimal number of inputs, and the desire to not burden the cross-program invocations this program is optimized to pointedly deserialize the few program parameters it needs.