Log application_Version in App Insights

From https://github.com/MicrosoftDocs/azure-docs/issues/9030

If someone is using an application version in their precompiled assemblies, we may be able to apply that to their App Insights logging in the `application_Version` field. It's somewhat possible to do this manually today with structured logging, but that only applies to user logs.

Options for non-precompiled assemblies could be to generate a hash on startup based on files -- we've prototyped this in the past but never went any further.

No file, test, or entry point is named. Start by reviewing the existing App Insights logging path and how precompiled assemblies expose an application version; clarify whether the goal is to support precompiled assemblies, generate a startup hash for other assemblies, or both, then define a testable version value in the application_Version field.

Written by the indexing model from the issue text.