Add outcome to transactions and spans

[gregkalapos]

Solves #940

• Introduces Outcome field on ISpan and ITransaction.
• Sets this field on all auto generated transactions and spans.
• Adds test to cover that automatically setting this fields in auto instrumentation works as expected.

[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request #956 updated]

• Start Time: 2020-09-14T13:43:22.908+0000

• Duration: 56 min 31 sec

Test stats 🧪

Test	Results
Failed	0
Passed	14077
Skipped	0
Total	14077

Steps errors

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• Name: Build

  • Description: .ci/windows/dotnet.bat

  • Duration: 0 min 22 sec

  • Start Time: 2020-09-14T13:53:56.687+0000

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