Context API Collection

[KeKs0r]

• expose Parent via context
• Improve context API to not not sound weird (e.g. the variable is called context, and then we have a getContext function on that? Maybe rename the current TaskContext to Scope or something else.
• Consider using Symbols for type inference
• ❓ should it be possible to set context in the same FN where it is accessed?

function myTask(input, {getContext, setContext}) {
  const before = getContext('foo')
  setContext('foo', 'bar')
  const after = getContext('foo')
}