Support objects in expressions

[TomasEng]

We should add a function that creates an object in the expression language.

Example:

[
  "object",
  "name", "Ola",
  "age", 42
]

returns { "name": "Ola", "age": 42 }.

Also, we should add support for object as a return value from expressions.

Acceptance criteria

• There is an object expression that creates an object form its arguments
• dataModel expressions that refer to an object return that object
• component expressions that refer to group components should return the value referred to in their group binding
• component expressions that refer to components with several bindings (like address) should return an object with those values
• A list function with objects in its parameters includes those objects in the list
• Other existing functions treat objects the same way they treat other invalid values