Allow a custom navigate to be provided to the Provider

[jasong689]

By default our components that control navigation SignInOrRedirect/SignOutOrRedirect use window.location. This causes window reloads and flashes of unstyled content. We can't make assumptions about an app's routing system, so we should allow consumers to pass in a custom navigate function that we'll use.

PR Checklist

• Important or complicated code is tested
• Any user facing changes are documented in the Gadget-side changelog
• Any immediate changes are slated for release in Gadget via a generated package dependency bump
• Versions within this monorepo are matching and there's a valid upgrade path

[infiton]

what would the provider setup look like in this case? Just so I can see what our template code will look like

[jasong689]

for react-router-dom it would be

const navigate = useNavigate();

<Provider api={api} navigate={navigate} auth={window.gadgetConfig.authentication}>
</Provider>

[infiton]

great