title: Expose BootTime in TraceProcessor
body: <p>I see that Microsoft.Windows.EventTracing.Interop.Metadata.NativeTraceLogfileHeader contains a value for BootTime. That could be useful in some cases. Any chance that will be exposed via the ITraceMetaData interface or can that be somehow else accessed?</p>
  <pre><code>// Microsoft.Windows.EventTracing.Metadata.ITraceMetadata
  using Microsoft.Windows.EventTracing;
  
  public interface ITraceMetadata
  {
      Version OSVersion
      bool Is32Bit
      FrequencyValue ProcessorSpeed
      TraceClockType ClockType
      FrequencyValue PerformanceCounterFrequency
      TraceTimestampValue? ReferenceTimestampValue
      FrequencyValue ProcessorUsageTimerFrequency
      TraceTimestamp FirstAnalyzerDisplayedEventTime
      TraceTimestamp LastEventTime
      TraceDuration AnalyzerDisplayedDuration    
      long LostBufferCount
      long LostEventCount
      string TracePath
      DateTimeOffset StartTime    
      DateTimeOffset StopTime    
      int ProcessorCount    
      int KernelEventVersion
  }
  </code></pre>
  <p><strong>Update</strong></p>
  <p>I have added the suggested code of dmatsion to <a href="https://github.com/Siemens-Healthineers/ETWAnalyzer/commit/afb624457e4fbb081467685f3698ee6768998f54" rel="nofollow noreferrer">ETWAnalyzer</a>.
  Now you can do</p>
  <pre><code>ETWAnalyzer -dump stats
  </code></pre>
  <p><a href="https://i.stack.imgur.com/XfR9B.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XfR9B.png" alt="enter image description here" /></a></p>