feat: add support for OP_RETURN output on the send path - #2753
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Adds an optional OP_RETURN (null-data) output to the send path. `zcash_client_backend` still plans and, for payload-free sends, builds the whole proposal. When a payload is present it rides the final transaction of the proposal (the ZIP-320 TEX exposure step, or the single step otherwise), which is built by driving the `zcash_primitives` transaction builder directly so `add_transparent_null_data_output` can be called; a Shield never carries a payload. Adds a validated `OpReturnData` newtype (<=80 bytes) with a typed error, and threads `Option<OpReturnData>` through `calculate_transactions`. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Adds an optional OP_RETURN (null-data) output to the send path by keeping
zcash_client_backendfor planning and bypassingcreate_proposed_transactionsonly for the payload-carrying transaction.