(character): add support for fetching a character and it's ID's in one call

[ReidWeb]

Description

We need to fetch a characters mounts and minions if they have them.

It's important this incorporates in the ability to inject the cache lookup service.

Use Case

As a consumer of the lodestone module I should be able to request a character, and it's minions with 1 call. In fact this should be the default behaviour.

Proposed Solution

• characters with no mounts should not incur a /mounts fetch operation
• characters with no minions should not incur a /minions fetch operation
• minion/mount id against injected service matching interface should be leveraged
• option to return only ids should be available

Other information

Relates to #22 , #24 , #23

Acknowledge

• I may be able to implement this feature request
• This feature might incur a breaking change