Use WithBatcher while adding a exporter to a provider in examples

[XSAM]

Some examples use SpanSyncer to export spans. But SpanSyncer is called synchronously, and users may just copy and paste to their projects, which will add latencies to the thread of users, say, a couple of milliseconds maybe.

So, maybe we should use WithBatcher instead of WithSyncer to add exporter to a provider in examples.