[web] Add CryptoStore to persistConfig.whitelist
We were previously excluding CryptoStore from redux-persist as we were working to avoid having to create a ton of migrations.
But now that we have primaryAccount/notificationAccount and primaryIdentityKeys/notificationIdentityKeys I think things are stable in the short term and we can start persisting.
Depends on D7081
Test Plan: Reload page and see that cryptoStore is included in REHYDRATE action:
Reviewers: ashoat, marcin, kamil
Reviewed By: ashoat
Subscribers: kamil, tomek
Differential Revision: https://phab.comm.dev/D7070