Automatically determine dimensions for aq.ArrayVar declaration

[rmshaffer]

Today the dimensions kwarg is required when declaring an aq.ArrayVar. For example:

aq.ArrayVar([1, 2, 3], dimensions=[3])

We should be able to automatically infer dimensions if an initial value is defined. So the code becomes just:

aq.ArrayVar([1, 2, 3])

Optionally, we may remove the dimensions kwarg altogether, and force the user to always specify an initial value.

[rmshaffer]

@Yash-10, thank you for the contribution! Can you please confirm that you'd like me to assign this issue to you?

[Yash-10]

Thank you @rmshaffer! Sure, I'd like to be assigned to this issue.