[lib] Add GET_SIWE_NONCE_[STARTED/SUCCESS/FAILED] to redux-types

Summary: Should've added these when I introduced lib/actions/siwe-actions.js:getSIWENonceActionTypes. Ran into a flow issue when I was trying to use createLoadingStatusSelector which flagged that something was missing.

Test Plan: Able to use createLoadingStatusSelector without issue later in the stack.

Reviewers: ashoat, tomek

Reviewed By: tomek

Differential Revision: https://phab.comm.dev/D5964