RCOCOA-2271: Collections in Mixed

[dianaafanador3]

• Added support for storing nested collections (List and Map not ManagedSet) in a AnyRealmValue.

  class MixedObject: Object {
    @Persisted var anyValue: AnyRealmValue
  }
  
  // You can build a AnyRealmValue from a Swift's Dictionary.
  let dictionary: Dictionary<String, AnyRealmValue> = ["key1": .string("hello"), "key2": .bool(false)]
  
  // You can build a AnyRealmValue from a Swift's Map
  // and nest a collection within another collection.
  let list: Array<AnyRealmValue> = [.int(12), .double(14.17), AnyRealmValue.fromDictionary(dictionary)]
  
  let realm = realmWithTestPath()
  try realm.write {
    let obj = MixedObject()
    obj.anyValue = AnyRealmValue.fromArray(list)
    realm.add(o)
  }
  

• Added new operators to Swift's Query API for supporting querying nested collections.

  realm.objects(MixedObject.self).where { $0.anyValue[0][0][1] == .double(76.54) }
  

  The .all operator allows looking up in all keys or indexes.

  realm.objects(MixedObject.self).where { $0.anyValue["key"].all == .bool(false) }
  

[dianaafanador3]

This is waiting for this PR to be merged to core. Also, there is one failing test which is working locally, taking a look at it, but putting this on review on the meantime.

[dianaafanador3]

@tgoyne and @leemaguire solved pr comments and there are some comments as well

[tgoyne]

There are a bunch of new warnings here that need to be fixed.

[dianaafanador3]

@tgoyne solved PR comments and removed the warnings