DO NOT MERGE - Review only - Handling instruction grammar outside of device

[PrisionMike]

Raising PR instead of an issue to summarise initial code changes required to handle the Solana instruction parsing outside of the wallet. Currently the instruction schema is a big cost on the flash space. The idea here is to send the instruction schema along with the transaction to save on storage.

We introduce an initial draft of a message definition that will be used to send the instruction. And subsequent code changes that this endeavour might ensue.

TODOs in the relevant files (*.py. *.rs are incorrectly included from another PR) highlight the main changes required. sign_tx.py -> instructions are as an embedded message in the additional info section of the transaction. The Transaction class needs to be dated in favour of the message generated SolanaInstruction class. get_single_instruction() was just being drafted for demo testing.

layout.py -> Needs a PropertyTemplate file for now to start with.