[Cashtab] Convert airdrop screen and deps to ts

Summary:
Need to fix how we handle p2sh token addresses (agora listings) in airdrops

Before fixing, convert to ts

Test Plan:
npm test

deployed at https://cashtab-local-dev.netlify.app/ to confirm deployments not busted

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D17326