Feat: Azure Blob Storage File Storage Plugin

[degenone]

I continued vibe coding and decided to take on #227. It turned out to be more work than expected but it seems to be working now.

I needed to touch on #195 to define the NuGet dependencies for the plugin.

public class PluginManifest
{
...
	public NuGetDependency[]? NuGetDependencies { get; set; }
...
}
public record NuGetDependency(string Package, string Version);

{
    ...
  "NuGetDependencies": [
    {
      "Package": "Azure.Storage.Blobs",
      "Version": "12.19.1"
    },
    {
      "Package": "Azure.Core",
      "Version": "1.44.1"
    },
      ...
  ]
}

To get the plugin to build with the DLLs I had to add <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies> to the projects .csproj file. Is there a better way? PluginPacker tool now looks at the manifest property to search and copy the dependencies to the .sspkg package.

I also needed a way to remove the FileStorage.FileSystem plugin so I had to implement #118. PluginManager.RemovePlugin and the changes to SharpSite.Plugins are where I most relied on Copilot, so this could use a careful code review.

There is now a warning in Plugin Management page if you have no or more than 1 plugins with FileStorage feature is installed.

The error when you have no FileStorage plugin installed and try to add an image is not very useful atm.