Add Authentication API (WIP)

[bonedaddy]

We should have an optional API that allows registering, and authenticating with TemporalX, to allow restricted access to the RPCs.

RPCs to add:

• Account

Account has the following request types, denoted as enums:

• REGISTER (allows registering an account within the system)
• CHANGE_API_KEY
• AUTH

To register you should provide:

• username (required)
• password (required)
• email (optional)

To change API key you should provide:

• username + password

To authenticate you should provide the API key, which the server will then validate. If valid a JWT is generated and added to the "context" of the RPC client connection. This JWT can then be used for quick validation within the RPCs that the auth process has completed.