feat: export WebStorageStateStore from oidc-client-ts

[jankc]

WebStorageStateStore is exported from oidc-client-ts but not re-exported from oidc-react. It is useful e.g. for switching userManager's userStore from session storage to local storage:

const userManager = new UserManager({
  userStore: new WebStorageStateStore({ store: window.localStorage }),
  ...
});

As userStore property is quite strictly typed creating own instance of WebStorageStateStore is not straightforward. It is also prone to incompatibility with future version of oidc-client-ts.

See Add export for WebStorageStateStore from oidc-client #344