Need to cleanup paddle/fluid/platform/profiler.*

[wangkuiyi]

1. Functions ParseEvents and PrintProfiler are only internally used and should be removed from profiler.h:

   Paddle/paddle/fluid/platform/profiler.h

   Lines 161 to 168 in 2bc5b08

   	// Parse the event list and output the profiling report
   	void ParseEvents(std::vector<std::vector<Event>>&,
   	EventSortingKey sorted_by = EventSortingKey::kDefault);
   	// Print results
   	void PrintProfiler(std::vector<std::vector<EventItem>>& events_table,
   	std::string& sorted_domain, const size_t name_width,
   	const size_t data_width);

2. EventKind is only internally used and should be renamed Event::Type.

   Paddle/paddle/fluid/platform/profiler.h

   Line 26 in 2bc5b08

   enum EventKind { kMark, kPushRange, kPopRange };

3. EventList is only internally used and should be moved into profiler.cc.

   Paddle/paddle/fluid/platform/profiler.h

   Line 60 in 2bc5b08

   struct EventList {

4. EventItem is only internally used and should be moved into profiler.cc