fix(core): surfnet encode_ui_account to handle ReadableAccount inputs and enable agave unstable api

[BretasArthur1]

Problem

• get_program_accounts_with_config was deprecated in favor of get_program_ui_accounts_with_config in newer solana_rpc_client release
• solana_runtime::commitment::BlockCommitmentArray has been marked for formal inclusion in the agave unstable api (causing warns about it)

Solution

• Make encode_ui_account generic over ReadableAccount with a trait-based access to raw bytes for IDL parsing, require Sync for locker usage, and pass through remote UiAccounts without re-encoding.
• Enable agave unstable api feature set in the solana-runtime crate