[Core, Protobuf, Foxx] Implement and utilize a collection_type in UserTokenGetRequest messages

[t-ramz]

Problem Statement

The collection type field in #1284 currently handles and validates string values, and there are a mappable and finite number of options

Description

Create an enum in SDMS.proto that can be used in the request and core to represent the options below:

MAPPED
HA
GUEST
PERSONAL

This enum will need to be included in other source files much like AccessTokenType in foxx/api/support.js and web/services/UserToken.js

Acceptance

• All references to collection_type are replaced by enum