feat: Make array schemas callable

[aleksanderkatan]

Changes:

• array schemas can be called with no arguments to create an array filled with default arguments (both JS and WGSL),
• array schemas can be called with another array to create a deep clone on JS side, and to "do nothing" on WGSL side (just like structs, again, we assume the assignment will do the job),
• some minor changes to struct and struct tests.

We concretisize the arrays a little too early, which results in some counterintuitive behavior. I created an issue for this: #1508

Also, here is another issue for unstructs and disarrays: #1504

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[reczkok]

Amazing🙇