Feature issue 615 f# nonpublic types

[SteveGilham]

The issue or feature being addressed

Addendum for issue #615 -- handle the case of non-public Sum or Record types. This is part of the agreed-to follow-up work in PR #758

Details on the issue fix or feature implementation

Add a parallel set of F# types which are non-public as a sample, and make the same assertions about what is or is not considered for coverage. In the filtering code, mask out the NonPublicRepresentation bit on the F# annotations.

Confirm the following

• I have ensured that I have merged the latest changes from the main branch (or whichever branch is appropriate) from opencover/opencover
• I have run build create-release locally and have encountered no issues
• I agree to follow up on any work required to resolve any issues identified whilst my request is being accepted

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This change is 

[sawilde]

thanks