Fixed optional array fields (Zod bridge)

[piotrpospiech]

Closes #1331

• Unwrap field if it is ZodOptional

Tested with:

• z.string().array().optional()
• z.array(z.string()).optional()
• other fields in the playground (All Fields (Zod))

[codecov[bot]]

Codecov Report

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

Project coverage is 94.36%. Comparing base (26335df) to head (4a55500).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1352 +/- ## ======================================= Coverage 94.35% 94.36% ======================================= Files 200 200 Lines 3314 3316 +2 Branches 895 896 +1 ======================================= + Hits 3127 3129 +2 Misses 70 70 Partials 117 117 ```

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