solana: add witnessed-trie #362
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Introduce a simple smart contract which maintains a sealable trie
while keeping the trie’s root hash in a witness account. Thanks to
account delta hashes, the value of the witness account can be proven
from Solana bank hash¹ which can then be used to generate state
proofs.
See https://research.composable.finance/t/state-proofs-on-solana/332
for more detailed description.