chore: add support for engine ARGB colors

[Caele]

Motivation

Requirements checklist

• Api specification
  • Ran yarn spec
    • No changes OR API changes has been formally approved
• Unit/Component test coverage
• Correct PR title for the changes (fix, chore, feat)

When build and tests have passed:

• Add code reviewers, for example @qlik-oss/nebula-core

[T-Wizard]

why?
It looks like the color is an expression that would work is engine evaluaded it but it was not evaluated by engine.

[Caele]

why? It looks like the color is an expression that would work is engine evaluaded it but it was not evaluated by engine.

Given the expression =argb(100,200,Sum(sales),255) engine will calculate a dual:
qNum: 29875577 // numeric rgba representation
qText: "ARGB(100,200,123,255)"
So when we are using a qStringExpression we only get the qText back. Most other applications of color by expression is on the hyperCube, and then we get both qNum and qText and tend to use qNum.