make examples use both input and output types of zod

@tionkje you have some lint errors. Please fix them. As for the PR - I see no reason not to use only z.input. An example should be an example of what comes into the object/validation and not its output.

This is similar to how we handle transform:

it('does support transformed schemas', () => {
    expectSchema(
      [
        z
          .number()
          .transform(num => num.toString())
          .openapi('Transformed'),
      ],
      {
        Transformed: {
          type: 'number',
        },
      }
    );
  });

I.e in the documentation we enter the input type.

And one more thing - we tend to add tests for pretty much everything new that is testable (even if a typescript change only). In this case I think you simply add the default case in the tests, please

asteasolutions / zod-to-openapi

make examples use both input and output types of zod #206