[WIP] configuring source link

[eddynaka]

Fix Issue #1760 .

See comment history on original PR: #1800

Changes

• configuring source link based on https://github.com/dotnet/sourcelink

Checklist

• I ran Unit Tests locally.
• CHANGELOG.md updated with one line description of the fix, and a link to the original issue if available.

For significant contributions please make sure you have completed the following items:

• Design discussion issue #
• Changes in public surface reviewed

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[eddynaka]

@TimothyMothra , i created a branch inside the repository and it seems to work. Can you check using the package manager and the latest build?

[TimothyMothra]

WOOT!! Nupkgs from the build server include SourceLink!!!