[bugfix] Ignore non stdtx

Son of Odinrequested to merge
ignore-non-stdtx into master

Someone issues a bep8 mini token which cause bifrost to get stuck and not be able to scan blocks. This change ignores/skips all non standard transactions. https://testnet-explorer.binance.org/tx/65970F1B78F5CC798F7187E34F06D71BF3F680D5D02BA5C93534B0995FB07CD5

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