chore: mv zod-to-json-schema (#9380)

## Summary

Move into subfolder. Rename to `zod3ToJsonSchema`. Limit exports.

Author: lgrammel

packages/provider-utils/src/schema.ts

@@ -6,7 +6,7 @@ import { arktypeToJsonSchema } from './to-json-schema/arktype-to-json-schema';
 import { effectToJsonSchema } from './to-json-schema/effect-to-json-schema';
 import { valibotToJsonSchema } from './to-json-schema/valibot-to-json-schema';
 import { Validator, validatorSymbol, type ValidationResult } from './validator';
-import zodToJsonSchema from './zod-to-json-schema';
+import { zod3ToJsonSchema } from './to-json-schema/zod3-to-json-schema';
 
 /**
  * Used to mark schemas so we can support both Zod and custom schemas.
@@ -210,7 +210,7 @@ export function zod3Schema<OBJECT>(
   return jsonSchema(
     // defer json schema creation to avoid unnecessary computation when only validation is needed
     () =>
-      zodToJsonSchema(zodSchema, {
+      zod3ToJsonSchema(zodSchema, {
         $refStrategy: useReferences ? 'root' : 'none',
       }) as JSONSchema7,
     {

packages/provider-utils/src/zod-to-json-schema/LICENSE renamed to packages/provider-utils/src/to-json-schema/zod3-to-json-schema/LICENSE

@@ -0,0 +1 @@
+export { zod3ToJsonSchema } from './zod3-to-json-schema';