Add support for numeric match at runtime

[wingertge]

Parses match statements with only numeric and wildcard arms as switch statements.
Or match arms are unrolled into their component elements for simplicity. Could theoretically use fallthrough or multiple selectors in cuda and wgsl respectively, but this also works.
Works the same as if else when the value is used as an expression.

Testing

Adds several runtime tests for the new switch statements.

[nathanielsimard]

What's the difference between the SwitchExpand and SwitchExpandExpr?

[wingertge]

SwitchExpandExpr creates an outer output variables and adds an assign statement to each branch to assign the return to the outer variable. It's the same as the IfExpandExpr, it's used to emulate Rust behaviour that allows using match as value in assignments. For typing reasons and to avoid a pointless assign in every branch, the two are split based on whether the match has a return value.