feat!: interval scope resolver

[cbochs]

Changes

• BREAKING Move builtin scope resolvers to require("grapple").resolvers
  • From require("grapple.scope").resolvers
  • If you were using the name of a builtin scope resolver, you should't be impacted
• BREAKING Scope resolver keys are now internal
  • Remove key from Grapple.ScopeOptions
  • Only builtin scope resolvers can be accessed by name
• FEATURE The cache option when creating a scope resolver now accepts a number (in milliseconds)
• INCOMPLETE (wip) add ability to create an asynchronous scope resolver (i.e. git branch)
• Fix issue where builtin scope resolvers were being cleared before setup
• Update README