Add support for settling to Solana

[mattgeddes]

With the LASR and related services, we are able to execute smart contracts on the Versatus network and have the results used to settle accounts on the Ethereum network. In this case, we want the LASR and related services to support the same for the Solana network.

This project can be broken down into multiple subtasks, which should be listed here:

• Create and deploy oracle contract to Solana network #783
• Wallet CLI changes to support multiple networks?
• LASR service changes to support multiple networks?

Acceptance Criteria:

• Being able to follow the same end-to-end flow as an external developer to deploy and execute a smart contract on Versatus and have it settle on Solana instead of Ethereum.
• Others?

By the time the LASR beta goes out, we should have documentation published that shows a developer how to publish and register a contract, and to execute it from their wallet and have it settle on Ethereum. This same workflow should work for Solana for this project to be considered resolved.

Tagging @ASmithOWL to add any additional context or tasks that come to mind.

Here's the repo containing the LASR code: https://github.com/versatus/lasr
And here's the repo containing the smart contract code: https://github.com/versatus/executable-oracle-eth

These may or may not be correct and there may also be other repos for other components.