[Tagging] Keyword filtering of a Taxonomy's tags

[bradenmacdonald]

Follows #110

"As a user viewing a taxonomy, I want to be able to search for terms in the taxonomy."

"As a user viewing a taxonomy, I want to be able to see every single tag in the taxonomy."

Acceptance Criteria

1. On the Taxonomy Detail Page, typing in the search box should filter the view to display only tags that contain the given text, or their ancestors.
   

Developer Notes

• Screenshots above are for convenience - Figma is the most up-to-date source for mockups. The scale of UI elements seen in the screenshots above may be incorrect.
• Make sure everything is keyboard accessible.

[ali-hugo]

@bradenmacdonald I noticed a mistake in the screenshot above that makes the proposed functionality confusing (the children tags under "astronomy" were incorrect). Here is an updated screenshot:

[bradenmacdonald]

Thanks @ali-hugo. Updated.