Test against Stargate/Tendermint 0.34

[zmanian]

Tendermint 0.34 is expected to be backwards compatible in the block signing proposal.

It is possible to drop amino entirely and use protobuf for Tendermint 0.34 signing and we should but the bytes on the wire should be identical. We should validate this week.

@tony-iqlusion @Shella

[ebuchman]

We're wrapping up a major overhaul to tendermint-rs this week and should be able to help update the KMS to it - includes dropping all Amino and replacing with protobuf.

[tony-iqlusion]

Current testing status is we've managed to have TMKMS complete the secret connection handshake with Tendermint v0.34 on the stargate-4 testnet.

It's managed to sign blocks and respond, however the signature/canonicalization logic is still using Amino encoding, so the signatures were rejected:

I[2020-10-29|19:18:26.445] Committed state                              module=state height=215762 txs=0 appHash=D6355CC836C19919CA5E61EC13CEC1B0D8DDF4F4B746149CBD9DEDEEF85F0EC2
E[2020-10-29|19:18:31.510] Error with msg                               module=consensus height=215763 round=0 peer= err="error adding vote" msg="[Vote Vote{4:8D958F00F757 215763/00/SIGNED_MSG_TYPE_PREVOTE(Prevote) 070FFAC5FF65 E615807F7779 @ 2020-10-29T23:18:31.354047807Z}]"
E[2020-10-29|19:18:31.940] Error with msg                               module=consensus height=215763 round=0 peer= err="error adding vote" msg="[Vote Vote{4:8D958F00F757 215763/00/SIGNED_MSG_TYPE_PRECOMMIT(Precommit) 070FFAC5FF65 70712338B911 @ 2020-10-29T23:18:31.786940937Z}]"
I[2020-10-29|19:18:32.054] Executed block                               module=state height=215763 validTxs=0 invalidTxs=0

[tony-iqlusion]

TMKMS is definitely Stargate-compatible at this point