Batch transactions in complex relays (#1669)
* batch transactions in message relay: API prototype * get rid of Box<dyn BatchTransaction> and actually submit it * test batch transactions * message_lane_loop_works_with_batch_transactions * removed logger * BatchConfirmationTransaction + BatchDeliveryTransaction * more prototyping * fmt * continue with batch calls * impl BatchCallBuilder for () * BatchDeliveryTransaction impl * BundledBatchCallBuilder * proper impl of BundledBatchCallBuilder + use it in RialtoParachain -> Millau * impl prove_header in OnDemandHeadersRelay * impl OnDemandParachainsRelay::prove_header (needs extensive tests) * added a couple of TODOs * return Result<Option<BatchTx>> when asking for more headers * prove headers when reauire_* is called && return proper headers from required_header_id * split parachains::prove_header and test select_headers_to_prove * more traces and leave TODOs * use finality stream in SubstrateFinalitySource::prove_block_finality * prove parachain head at block, selected by headers relay * const ANCIENT_BLOCK_THRESHOLD * TODO -> proof * clippy and spelling * BatchCallBuilder::build_batch_call() returns Result * read first proof from two streams * FailedToFindFinalityProof -> FinalityProofNotFound * changed select_headers_to_prove to version from PR review
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