[native] add rn-emoji-keyboard dependency

Summary:
Add rn-emoji-keyboard dependency.

https://github.com/TheWidlarzGroup/rn-emoji-keyboard

Test Plan: N/A

Reviewers: atul, tomek, ashoat

Reviewed By: ashoat

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D6413