* Add SBRP attribute

* Generate SBRP attribute with PackageSourceGenerator

* Generalize adding attribute to CSharp file

* Update CSharp file attributes

* Add attributes to beginning of file

* Use msbuild to add attribute

* Revert PackageSourceGenerator changes

* Build with CSharp file

* Rename file, add license header, fix spacing, use different compile item

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Co-authored-by: Ella Hathaway <[email protected]>