* A first run at fleshing full REST API spec.
- Added a new REST OpenAPI YAML specification to the docs folder, starting from the minimal validator spec.
- Added a bunch of additional endpoints, including network information and beacon chain information.
- Current yaml file has not been checked for syntax or any correctness.
* Fixed REST OpenAPI Spec.
- Updated spelling mistakes, indentation, and incorrect fields.
* Added block_discovery endpoint to REST API spec.
* Added /node/stats endpoint
- /node/stats endpoint provides information about the running process
- Added some extra TODOs as reminders.
* Added missing Attestations to REST spec.
- Added ability to get attestations and pending attestations from chain data.
- Moved the Attestaion object into its own schema, with reference.
