Add Related instances relationship type reference record API

Purpose: (taken from UIIN-340) Enhance the functionality in Instance record, accordion Related instances with associating Related instances by using the instance look-up component - similar to what has been implemented for e.g. Instance relationship.

Use case: (taken from UIIN-340)

1. As a cataloger I want to associate related titles to my instance record. A typical example can be, different editions, different material type; e.g. the printed version, of the audio book being cataloged, or the movie on dvd based on a printed book (the novel) etc.
2. As a cataloger I find the related instances by using the instance look up component which search within Inventory to find, e.g. the audio book version of 'The girl on the train'

Context:

Refer to UIIN-340 and UIIN-231 for how this will be used in the UI.

Work Scope:

• Introduce a new reference record API (similar to instance relationship types) for related instance relationship types
• Add reference data for the following relationship types:
  • Available in another form
  • Constituent unit
  • Data source
  • Has subseries 
  • Has supplements
  • In
  • Issued with
  • Main series
  • Other edition available
  • Related item
  • Supplement to
  • Translated as
  • Translation