Currently the 'fields' query parameter is used throughout the 'roles' and rolebindings APIs with differing documentation, defaults and usage. Simplifying the documentation and creating a reusable scalar type to be used by all the APIs will keep our APIs consistent and prevent drift.

https://typespec.io/docs/language-basics/scalars/ 

/**			 
* Field mask used by the `fields` query parameter.			 
*			 
* Examples:			 
* - `id,name`			 
* - `id,name,owner(id,email)`			
*/			
scalar FieldMask extends string; 

some context of why: https://darrenhobbs.com/2007/04/11/tiny-types/ & https://www.geepawhill.org/2019/01/25/tdd-pro-tip-wrap-containers-early-often/ 

Acceptance Criteria:

• Scalar type for fields query
• Scalar type for cursor, limit and offset
• Scalar type for order_by
• Defaults for corresponding types