Support for GraphQL-based APIs + Suggestions & Control + Nionic

[jrcrawfo]

Why?

• Need to support GraphQL-based APIs for new Suggestions & Control interface and Nionic Platform
• General performance improvements of commands to make the CLI easier to use (by caching tokens)

What changed?

• Reorganized how environments and authentication works to use a common config file instead of having that defined within the services
• Added the use of a token cache (~/.contxt/auth_tokens) to prevent new token retrieval on every CLI command or running of an algorithm
• Support for GraphQL-based services
• Added an initialization command to perform code generation for any GraphQL-based APIs
• Cleanup unnecessary CLI commands
• Fix re-initializing a defaults file