feat: add support for nested inputs

[lcjnil]

@iway1 Hello, I recently discovered that the trpc-panel was not correctly handling nested input, such as the  createNestedPost function which was added in this pull request.

[dca123]

This will also fix #78 . However, before the reduce we should verify that each instance is a zod object. Else we can return { parseInputResult: "failure" };