[FEATURE REQ]GlobalRegionSwitch within SDK

[xinlian12]

By default, for goneAndRetryPolicy, SDK will retry in local region for up to 30-60s before do cross region retry. Adding a possible mechanism (like in session token retry )to trigger faster cross region retries.

With the foresee future where we might want to guard the region switch for other retry policies as well, instead of adding region switch just for goneAndRetryPolicy, consider adding a global region switch which can be applied for different retry policies.