Extension Spec: Core

[xlc]

The core extension. Should provide commonly used features.
Need to balance between having too many features vs too less. Some less commonly used features could be on another extension for example.

• Feature discovery instructions
  • hasExtension(id: ExtensionId) -> bool
• Crypto functions
  • blake2_64
  • blake2_128
  • balke2_256
  • ...
• Raw storage accessor
  • readStorage(key: Vec) -> Vec
  • nextKey(key: Vec) -> Vec
  • nextKeys(key: Vec, count: u16, startKey: Option<Vec>) -> Vec<Vec>