Nuget build reconstruction - Compiler flags

[JanKrivanek]

Background

More details in #8510

Based on #8475 create prototype of reconstructing nuget build based on the compiler flags in Pdb.

Expected output

Prototype pluggable to #8510

[JanKrivanek]

Compiler flag reconstruction was decided not to be part of the prototyping work.

The acievability and opportunity data were reconstructed via existing nuget telemetry data and are part of the conclusion here: #8510 (comment)