[Engineering] Improve SDK Build times, refactor solutions

[stevengum]

7/20/20 Edit:

Some potential steps to address these issues involve educating the team about some of steps outlined on "Load a filtered solution" which includes topics such as not loading projects and solution filter files which can be checked into source control.

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Original post:

There are a few issues with the current .sln file setup that should be investigated and addressed.

• Build time is slow
• Loading a solution is slower (not really, but it feels like it)

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First step: profile build times to collect data. Look into utilizing logging capabilities that already exist in msbuild.exe