Errors thrown when opening a Realm (using Realm JS) with an invalid schema contains types and terminology which is not used anywhere in the RealmJS documentation.

For example, when accidentally defining a schema with a list with optional elements of some object type:

const Realm = require("realm");
new Realm({
  schema: [{
    name: "SomeClass",
    properties: {
      someList: { type: "list", objectType: "SomeClass", optional: true },
    },
  }],
});

The following error [is thrown](
https://github.com/realm/realm-object-store/blob/master/src/object_schema.cpp#L167):

Error: Schema validation failed due to the following errors:
- Property 'SomeClass.someList' of type 'array' cannot be nullable.

It uses words like "array" and "nullable", which is not a part of the Realm JS terminology. This is potentially very confusing for a newcomer trying to write a schemas and getting errors in the process.

I created this issue on the realm-object-store repository because I believe it should support some sort of mapping of these terms on a per-SDK level. An alternative solution would be to check for these conditions in Realm JS, before parsing a potentially invalid schema to object store, but that duplicates logic across multiple code-bases and that also didn't seem ideal.