Would be nice to know the defaults #4330

When tuning it's important to know something about the defaults as the number of possible combinations is rather large and not knowing where one starts is rather a poor first step trying to optimize a model

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• ID: c16a2948-f15c-1e3a-d6c0-1cfaae544d57
• Version Independent ID: 0447cd1a-a1a3-76da-2ea3-c9f9efc051c1
• Content: LightGbmMulticlassTrainer.Options Class (Microsoft.ML.Trainers.LightGbm)
• Content Source: dotnet/xml/Microsoft.ML.Trainers.LightGbm/LightGbmMulticlassTrainer+Options.xml
• Product: dotnet-ml-api
• GitHub Login: @sfilipi
• Microsoft Alias: johalex