Allow creating a list of lists from an array of arrays

[jabraham17]

This PR allows creating a list of lists from an array of arrays. Previosuly, the following resulted in a confusing error to users.

var a: list(list(string)) = [["a", "b"], ["c", "d"]];

To resolve the issue, users needed to write the following to workaround this.

var a: list(list(string)) = [new list(["a", "b"]), new list(["c", "d"])];

This PR extends the existing code that allows implicit list creation from arrays to handled arrays and arrays, so that both of the above code snippets work the same. This is also extendable to arrays of arrays of arrays.

Testing

• paratest without comm
• paratest with comm

Resolves #24277

[Reviewed by @lydia-duncan]

[lydia-duncan]

Nice! We just want to make sure that list(array(something)) doesn't run into problems as a result of this change.

[jabraham17]

Looks like it does

use List;
var a = new list([[1,2,3],[4,5,6]]);
compilerWarning((a.type:string));
writeln(a);

This code works on both main and this branch

This compiles on both main and this branch, but segfaults at runtime for both main and this branch. Not sure whats going on there...

use List;
var a: list([0..<3] int) = [[1,2,3],[4,5,6]];
compilerWarning((a.type:string));
writeln(a);

I will add both of these as tests before I merge this PR (the latter being a future)