helpers idea: loadOrCreateKeypair
accepts an env var name of file path name
if file path provided, attempt to load it or generate/save a fresh one to that path
when a new keypair is generated:
optional flag to auto airdrop it
same thing for env var. if it exists, load it. if it does not generate/save it
From @nickfrosty:
MM: similar to https://github.com/Unboxed-Software/solana-cnft-demo/blob/starter/src/utils.ts#L24 used in the course for compressed NFTs, which would support making this.