Add an account contract with secp256r1 sig verification and test end-to-end #1402
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### What Add support for secp256r1 signature verification (picking up env changes stellar/rs-soroban-env#1376). And adapts the existing `Crypto` module by split the cryptographic functions into two sets: - `Crypto`: standard, recommended set of cryptographic functions. This includes `secp256k1_recover` and `secp256r1_verify` taking the full `message: Bytes` as input and performs hashing underneath. - `CryptoHazmat`: hazardous material. Contains low-level, unsecure if used incorrectly functions including `secp256k1_recover_prehash` and `secp256r1_verify_prehash`, taking a `message_hash: BytesN<32>` as input. Design rationales were discussed in the env PR (started on stellar/rs-soroban-env#1376 (comment) and onward). XDR changes associated with the new contract spec: stellar/stellar-xdr#182, stellar/stellar-xdr#183 rs-xdr: stellar/rs-stellar-xdr#361 End-to-end with secp256r1 account contract: stellar/rs-soroban-env#1402 ### Why [TODO: Why this change is being made. Include any context required to understand the why.] ### Known limitations [TODO or N/A] --------- Co-authored-by: Leigh McCulloch <351529+leighmcculloch@users.noreply.github.com>
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What
Test changes in stellar/rs-soroban-sdk#1246
Why
[TODO: Why this change is being made. Include any context required to understand the why.]
Known limitations
[TODO or N/A]