[CORL-3171] allow swapping between Giphy and Tenor

[nick-funk]

trafficstars

What does this PR do?

• Allow switching between Giphy and Tenor in Admin > Config
• Add new Tenor search and preview elements in the stream

TODO:

[ ] need to map content ratings from Giphy vals to Tenor in the tenor endpoint [ ] fix weird issue where you need to always type something to post a gif

These changes will impact:

• [X] commenters
• [ ] moderators
• [X] admins
• [X] developers

What changes to the GraphQL/Database Schema does this PR introduce?

None

Does this PR introduce any new environment variables or feature flags?

No

If any indexes were added, were they added to INDEXES.md?

N/A

How do I test this PR?

To test the tenor endpoint, set the API key in the Coral Admin > Config and then you can call queries for results via:

http://localhost:3000/api/tenor/search?query=excited

(this will do a query for "excited" gifs)

Were any tests migrated to React Testing Library?

No

How do we deploy this PR?

• Merge into develop
• Cut a release
• Turn off Giphy on all clients who use gifs
• Migrate API keys for tenor into various SaaS and O&O clients
• Deploy new release to clients/O&O
• Turn Tenor on for all clients who use gifs

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