Implement versioning and NIP-44 support

[rolznz]

See https://github.com/nostr-protocol/nips/pull/1531

Notes:

• Alby Hub should indicate support for 1.0 and 0.0, and maintain support for 0.0 for the unforeseen future.
• This should be implemented in the Alby JS SDK (and therefore at least Alby Go + Alby Extension) to ensure the full flow is working.
• See how NIP-47 notifications fits in with versioning.
• Add unit tests to ensure we maintain support for both versions and return the correct error code for unsupported versions.

[rolznz]

@bumi @im-adithya any thoughts?