Manually specify a cluster url and/or keypair.
Those values otherwise default to the Solana CLI config file.
All values other than url and keypair exist only to satisfy compatibility
with keypair resolution.
Perform Shadow Drive operations on the command-line.
This CLI is written in Rust, and conforms to the interfaces
for signer specification available in the official
Solana command-line binaries such as solana and spl-token.