add `ConsensusType` to voyager

[benluelo]

this would give us:

• chain id: unique identifier for a chain. a chain is associated with exactly one consensus type and one or more ibc interfaces.
• consensus type: verifiable consensus mechanism for a chain (tendermint, cometbls, eth beacon, etc). this is verifiable by many client types.
• client type: implementation of a light client that is capable of verifying a consensus (cometbls, cometbls-groth16).
• ibc interface: environment that a client runs in (ibc-go native, ibc-go 08-wasm, ibc-solidity, etc).

currently client type is overloaded as both consensus & consensus verification, which is incorrect - there can be multiple ways to verify a consensus.