[cashtab] Link to the token page from the tx history

Summary:
Makes it easy to send, buy or sell a token from the tx history, including airdrops.

Depends on D17451.

Test Plan:

npm run test
npm run start

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D17454