Example code of generating the query schema with schemas.rs to be used in documentation, potentially.

[JasoonS]

Here is what it looks like in the docs: enviodev/docs#491

Some issues and concerns to think about:

• The strings in the field selection are not being produced in schemas. We need to look at using an array or something else to get this to work. I should also look at the Python and JavaScript clients to see if there's anything relevant we can maybe use.
• Doing this has made these types slightly more complicated, and we don't have the flexibility of changing case for TypeScripts or Python versions of the API, so maybe we should keep generation of these schemas separate via some script that helps maintain it.