The `ckb-cli tx` multisig tx file is not compatible with Neuron

[doitian]

The ckb-cli tx file is not compatible with Neuron Multisig-Tool.

I uploaded example files here: https://github.com/cryptape/ckb-multisig-cobuild-poc/issues/1

Except the context, and the transaction keys, the signature field is also incompatible. ckb-cli saves the signature, and Neuron saves the pub key hash and stores the signatures in witnesses.

Also reported in https://github.com/nervosnetwork/neuron/issues/3048