Add Paket support

[jhutchings1]

This PR adds support for the paket.lock format to the existing Nuget detector.

[github-actions]

👋 Hi! It looks like you modified some files in the Detectors folder.
You may need to bump the detector versions if any of the following scenarios apply:

• The detector detects more or fewer components than before
• The detector generates different parent/child graph relationships than before
• The detector generates different devDependencies values than before

If none of the above scenarios apply, feel free to ignore this comment 🙂

[JamieMagee]

@amitla1 Can you update the version of this detector please?

component-detection/src/Microsoft.ComponentDetection.Detectors/nuget/NuGetComponentDetector.cs

Line 31 in 3254e5d

public override int Version { get; } = 2;

It needs to be updated any time the detector is expected to return a different number of dependencies.