fix: make zod a peerDependency to dedupe installed versions

[ianduvall]

Summary

Moves zod to be a peer dependency as suggested by the zod maintainer

Test plan

TBD

Issue number

Closes #187

Checks

• I've added new tests (if relevant)
• I've added/updated the relevant documentation
• I've run pnpm test and pnpm test:examples
  • (If you made a major change) I've run pnpm test:integration (see details)
• I've made sure tests pass
• I've added a changeset using pnpm changeset to indicate my changes

[changeset-bot]

⚠️ No Changeset found

Latest commit: aa11304

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[ianduvall]

@seratch tagging you for review

[seratch]

@ianduvall Thanks for sending this PR! I don't have the bandwidth to carefully check this issue right now, but will start working on this soon.

[pungoyal]

@ianduvall you should be changing the relevant readme files as well?