[dotnet] Extract downloadable zip file in memory

[nvborisenko]

Description

There is no need to put a zip file to disk.

Motivation and Context

Fixes #13276

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[nvborisenko]

I am not sure we have unit tests for this, but I verified it via building the package and using it in examples repo. It passes.