Add an ABCI CheckTx method equivalent for IBC

[hu55a1n1]

Crate

ibc

Summary

Add a decode() function that mimics the abci::CheckTx method similar to the deliver() function.

Problem Definition

This would be useful for ABCI applications to determine whether the incoming messages are valid IBC messages.

Proposal

Extract parts of the deliver() function into a separate function that decodes the prost message into a domain type.

Acceptance Criteria

Provide a function that can be used to check if incoming transaction messages are valid IBC messages, and reuse this function in the deliver() function.

pub fn decode(message: Any) -> Result<Ics26Envelope, Error>

Might also be nice to have impl TryFrom<Any> for Ics26Envelope.

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