dry-run mode for init bridge command

[bkontur]

this logs encoded call, which can be decoded with: https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A9944#/extrinsics/decode

2022-12-01 13:18:05 +00 INFO bridge Connecting to Millau node at ws://localhost:9945
2022-12-01 13:18:05 +00 INFO bridge Connecting to Rialto node at ws://localhost:9944
2022-12-01 13:18:05 +00 INFO bridge Millau-headers bridge at Rialto is already initialized. Skipping
2022-12-01 13:18:06 +00 INFO bridge Prepared initialization data for Millau-headers bridge at Rialto: InitializationData { header: Header { parent_hash: 0x706da343a66a7418a5da14f0c73b0954057d9c204eef51666457d1c26a73fff5e1229b75db928c363ca907b01d332fd1cf7a1b0a1972147169b961cecdcc7cd2, number: 367, state_root: 0xcf087713bce805f36c875b5a8e36cc7becda55f0e6164364b67c52f5646d862f22df29ae6be5a29fc70b8fbe3689f60848bd8b1e8fe6c876b6694b62210787c1, extrinsics_root: 0x879e2c3f57009eb6e588155a7d8734c91633fa80947e0eadcaa6fdf47d9a2cdf2cee18c0d6e18697a77b88373558fe82a3b42be74f18295c664faa109409751d, digest: Digest { logs: [DigestItem::PreRuntime([97, 117, 114, 97], [235, 198, 150, 16, 0, 0, 0, 0]), DigestItem::Consensus([66, 69, 69, 70], [3, 67, 241, 226, 32, 0, 48, 31, 116, 246, 36, 233, 133, 105, 90, 91, 39, 102, 115, 164, 43, 247, 172, 130, 208, 235, 110, 12, 193, 255, 232, 213, 248]), DigestItem::Seal([97, 117, 114, 97], [120, 114, 152, 244, 122, 30, 200, 107, 184, 228, 36, 100, 74, 70, 234, 146, 164, 211, 83, 110, 242, 187, 153, 185, 43, 208, 162, 229, 156, 197, 102, 21, 79, 100, 17, 196, 30, 240, 147, 25, 167, 182, 42, 214, 204, 12, 58, 137, 186, 105, 60, 171, 90, 31, 235, 58, 45, 74, 225, 141, 228, 101, 81, 137])] } }, authority_list: [(Public(88dc3417d5058ec4b4503e0c12ea1a0a89be200fe98922423d4334014fa6b0ee (5FA9nQDV...)), 1)], set_id: 6, operating_mode: BasicOperatingMode::Normal }
2022-12-01 13:18:06 +00 INFO bridge Initialize bridge call encoded as hex string: "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"
2022-12-01 13:18:06 +00 ERROR bridge Failed to submit Millau-headers bridge initialization transaction to Rialto: SubmitTransaction("Rialto", Custom("Not submitting extrinsic in `dry-run` mode!"))