Query builder v2

[quinchs]

Summary

This PR adds the long awaited query builder to the main development branch. Before this awesome feature can be added, there is still some stuff to add:

TODO:

• Base query functions.
  • select
    • Basic select funtionality.
    • Support for JsonVariable.
    • Advanced default shape generation.
    • Shape API clarification.:
      • Reference selects, ex: select x
      • Type selects, ex: select Person
      • Mixed shapes for both
  • update
    • Support for JsonVariable.
  • delete
    • Support for JsonVariable.
  • insert
    • Support for JsonVariable.
    • Smart property access (only set properties which are required or dont have default value)
  • with
    • Context reflects with blocks
    • Maintain sub query shape on references
    • Scalar value serialization
    • Array serialization
    • Set serialization
    • Reference set serialization
  • for
    • Retest and fix based on std::array_agg has inconsistent behavior when the input set is a query edgedb#4090, name field: expected <class 'edb.schema.name.QualName'> but got <UnqualName array<default|MultiLinkPerson>> edgedb#4080, and std::array_get doesn't return if input is result of a sub-query edgedb#4094
  • group (dependent on CIL parser)
• EdgeQL standard library.
  • Add generator for stdlib.
  • Update v1 system for calling std functions to newer & faster version.
  • Update naming conventions to match the edgedb docs.
• Link support.
  • Single links
  • Multi links
  • Link backreferencing, ex person1 points to person2 which points to person 1 recursively.
• Backlinks
• Property selection/mutation logic
• Free objects
• Anonymous types as shapes
• Base expression to edgeql translators ex: string (string a) => a.ToLower(); -> str_lower(a)
  • Parameter context (don't allow usage of a parameter in some conditions)
  • Binary: 1+1
  • Conditional: 1 if true else 2
  • Constant: "const"
  • Initialization: new Thing{}
  • Lambda: () => {}
  • Member: x.Property
  • MethodCall: EdgeQL.ILike(a,b);
  • Array: new int[] { 1, 2, 3 }
  • Parameter (x) => x.Thing;
  • Unary: (string)thing;
• Contextual function calls
• Object-level constraints
• Property level constraints
• Autogenerated node resolution quinchs/EdgeDB.Net#22
• CIL parser (CIL -> Expressions).
• Unit tests
• Docs

Closes #17