* Add VersionAssemblyName to package manifest
* Fix/improve nullability
* Ensure package version from manifest is set when package migration exists
* Set versionAssemblyName in umbracopackage template
* Use Assembly.Load instead of ITypeFinder
* Use AssemblyLoadContext to get asesmbly by name
* Get version from package migration assembly
* Hide unknown package version
* Set versionAssemblyName in umbracopackage-rcl template
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