Add ability to open an existing trace #136
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FerrisETW doesn't currently expose any function to open an existing trace, without starting it. This can be useful to trace events from the Microsoft-Windows-Security-Auditing provider, as only one session is allowed on this provider, and this session is created by the OS (see https://github.com/microsoft/krabsetw/blob/master/examples/ManagedExamples/UserTrace005.cs).
This PR aims at providing a function similar to start_trace, but to be used with already existing traces.