Module: Add custom chocobo NPC as example

[zach2good]

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• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

The plumbing to register a chocobo with various colours and traits has been in the codebase for furiously checks notes... 4 years, and I haven't really seen people using it. It's been documented in the !chocobo command the whole time, and more recently cleaned up to be super clear by sruon.

This adds a custom NPC to the GM home test module to really hammer home how to use this binding.

Steps to test these changes