Option for making fields required by default when writing a schema

[stephenberry]

Discussed in #1571

^{Originally posted by Yzen90 January 20, 2025}
Hello, would it be possible to add an option to make fields required by default when generating a JSON schema?

Something like this:

struct MyObject {
  struct Child {
      string a_field;
  } child;
};

// Set `child` and `a_field` as required in the generated schema:
auto schema = glz::write_json_schema<MyObject, glz::opts{.require_all_fields = true}>();

Thanks