Add memory collection params to CaptureOptions
Add memory collection params to CaptureOptions

With this change, we update the CaptureOptions proto to provide
parameters for the memory usage information collection. More
specifically, we add the boolean param collect_memory_info to indicate
whether we enablecollecting memory information, and the
memory_sampling_period_ns to control the polling rate of /proc/meminfo/.

google/orbit,google/orbit,google/orbit,google/orbit