Add ability to use `z.discriminatedUnion` and `z.union` in schemas

[jpwilliams]

Summary

Add the ability to use z.discriminatedUnion() and z.union() (as long as it's only a union of valid types).

Note that z.discriminatedUnion() will likely be deprecated in lieu of z.switch(), though this API is not yet available. See colinhacks/zod#2106.

Checklist

• [ ] Added a docs PR that references this PR N/A
• [x] Added unit/integration tests
• [x] Added changesets if applicable

Related

• Fixes #396
• colinhacks/zod#2106

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: e14b054fdbcdc01b0897d189143e6fb9c7421a1d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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