fix: Add typed union validation

[FrederikBolding]

Adds a typedUnion utility which strictly validates members of the union based on a type field. This should reduce the noise when trying to parse through Superstruct validation failures resulting in validating large unions such as the JSX unions.

This doesn't solve the Superstruct union problem generally as we still have many unions of unions, but it might make the problem easier to solve.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.95%. Comparing base (c5c2514) to head (b365cfa).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2534 +/- ## ========================================== + Coverage 93.94% 93.95% +0.01% ========================================== Files 456 456 Lines 9542 9568 +26 Branches 1458 1465 +7 ========================================== + Hits 8964 8990 +26 Misses 578 578 ```

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