Account key support

[jeromy-cannon]

Tasks

Beta Give feedback

1. Update solo account create to rename --private-key to --ed25519-private-key
2. Update the solo account create command description from: Creates a new account with a new key and stores the key in the Kubernetes secrets to: Creates a new account with a new key and stores the key in the Kubernetes secrets, if you supply no key one will be generated for you, otherwise you may supply either a ECDSA or ED25519 private key
3. Update solo account update to rename --private-key to --ed25519-private-key
4. Update solo account update to add support for --ecdsa-private-key
5. Update solo account update command description from: Updates an existing account with the provided info to Updates an existing account with the provided info, if you want to update the private key, you can supply either ECDSA or ED25519 but not both
6. ensure flags, prompts, and test cases are also updated/covered appropriately