Make ContentCapture event contains parcelable span

The spans were removed by ag/13819626. Adds them back into the
ContentCaptureEvent. And removes unnecessary Map data because we
can get it via travel events. The total of events is not large.

Bug: 190035037
Bug: 184311217
Test: atest CtsContentCaptureServiceTestCases
Test: atest FrameworksCoreTests:ContentCaptureEventTest
Change-Id: I5fa1f7a6b51fd050a63731543cca98972c294b22