Add support for reading capture data from a file handle

[heck-gd]

Add a CaptureHandleReaderDevice that can be instantiated with an existing file handle. This is advantageous in situations where one would like fine-grained control over how the handle is opened.

[kayoub5]

Missing Unit Tests

[codecov-commenter]

Codecov Report

Merging #400 (bebe7fa) into master (790246e) will decrease coverage by 21.08%. The diff coverage is 74.28%.

@@             Coverage Diff             @@
##           master     #400       +/-   ##
===========================================
- Coverage   83.18%   62.09%   -21.09%     
===========================================
  Files          49       51        +2     
  Lines        2748     2781       +33     
  Branches      301      304        +3     
===========================================
- Hits         2286     1727      -559     
- Misses        343      960      +617     
+ Partials      119       94       -25     

Impacted Files	Coverage Δ
SharpPcap/LibPcap/CaptureFileReaderDevice.cs	70.00% <ø> (-0.74%)	:arrow_down:
SharpPcap/LibPcap/CaptureHandleReaderDevice.cs	71.42% <71.42%> (ø)
SharpPcap/LibPcap/LibPcapSafeNativeMethods.cs	54.28% <80.00%> (-2.39%)	:arrow_down:
SharpPcap/LibPcap/CaptureReaderDevice.cs	100.00% <100.00%> (ø)
SharpPcap/LibPcap/PcapDeviceCaptureLoop.cs	87.80% <100.00%> (ø)
SharpPcap/WinpkFilter/DriverHandle.cs	0.00% <0.00%> (-100.00%)	:arrow_down:
SharpPcap/WinDivert/WinDivertHeader.cs	0.00% <0.00%> (-100.00%)	:arrow_down:
SharpPcap/WinpkFilter/NativeMethods.cs	0.00% <0.00%> (-100.00%)	:arrow_down:
SharpPcap/WinpkFilter/WinpkFilterHeader.cs	0.00% <0.00%> (-100.00%)	:arrow_down:
SharpPcap/WinpkFilter/WinpkFilterDriver.cs	0.00% <0.00%> (-96.78%)	:arrow_down:
... and 18 more

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[heck-gd]

Added tests now, they're for the most part based on the ones for files. One ugly part is the whole Handle/FILE* shenanigans, which required me to add a reference to Mono.Posix.NETStandard to the test project. But it can't be helped, because libpcap doesn't accept a native fd on non-Windows systems.

[kayoub5]

@heck-gd take a look at proposed changes in https://github.com/dotpcap/sharppcap/pull/403/commits/3de9ac7417b5dbb0bb397b71ab5156beba33f5cd

[kayoub5]

@heck-gd The new API requires specific Libpcap versions, could you handle the TypeLoadException caused by missing functions and throw NotSupportedException instead?

Also add the [LibpcapVersion("....")] attribute to the tests to mark minimum Libpcap version needed for the test to run

[kayoub5]

@heck-gd could you rebase your PR into one commit?

[heck-gd]

@heck-gd could you rebase your PR into one commit?

Done. I've also cherry-picked your commit from #403.