Introduce tokens as int-id amended Identifiers to the ast

o Provide new planner with PlanContext
o Move {Label|PropertyKey|RelType}Id to ast
o Sketch out token resolution in Planner
o Use PropertyKeyTokens in Property, MapExpression, and schema commands
o Use LabelToken in HasLabels
o Use RelTypeToken in Patterns
Resolving tokens in the ast for the new planner
Add more tests for resolving token in ast for new planner
Renaming Token to SymbolicToken and TokenId to NameId
Split label id information from case class head of {Label|Property|RelType}Names
Merge pull request #2093 from boggle/2.1-resolve-tokens

2.1 Introduce token ids into the ast and resolve them for Ronja