Stellar Protocol 26 Upgrade - #384
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This PR upgrades the SDK to support Stellar Protocol 26, introduces Smart Contract Constructor support, and improves async transaction handling.
Changes:
Upgrade stellar_base dependency to ~> 0.17.0 to support Protocol 22, 23, and 26.
Add CreateContractArgsV2 implementing CAP-0058 for Smart Contract Constructor support.
Update HostFunction to support the :create_contract_v2 host function type.
Add async transaction error types: AsyncTransaction, AsyncTransactionError, and an ErrorMapper to handle Horizon async error responses (400, 409 duplicate, 409 try-again-later, 504).
Update CI/CD runners to ubuntu-latest (ubuntu-24.04), bump OTP to 26.2/27.2 and Elixir to 1.16/1.17, update actions/cache to v4, and upgrade Credo to ~> 1.7.