Support ArrayIndex for ScalarValue(List)

[alamb]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
(This section helps Arrow developers understand the context and why for this feature, in addition to the what)

Describe the solution you'd like
The idea is to support expressions like

-- result is 5
[5,4,3,2,1][1]
-- result is 1
[5,4,3,2,1][5]

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
@ovr is working on this