[Timebox] Add "dotnet nuget install" command

[akoeplinger]

NuGet Product(s) Involved

dotnet.exe

The Elevator Pitch

Related to #4855

We had multiple internal teams at MSFT who are doing a migration to Mariner reach out to us when moving from Mono's nuget(which is just the nuget.exe CLI) to the dotnet CLI and one common pain point was the missing support for the install command.

Most of these teams are not even using .NET but have some tool which is hosted on an internal AzDO feed and they were using nuget install <tool> e.g. from CMake to grab the assets. Right now you need to create a dummy .csproj like this so you can run dotnet restore on it which makes this a lot more complicated:

<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
   <OutputType>Exe</OutputType>
   <TargetFramework>net6.0</TargetFramework>
   <RestorePackagesPath>packages</RestorePackagesPath>
</PropertyGroup>

<ItemGroup>
  <PackageDownload Include="Some.Internal.Tool" Version="[7.0.7]" />
</ItemGroup>

</Project>

It'd be great if we could get dotnet nuget install supported in the future 😄

Additional Context and Details

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[JonDouglas]

Adding a quick comment here.

We've had a number of requests for this specific feature. Basically the concept is to acquire a NuGet package without a .csproj and without being so tied down to a project system to get an asset to disk.

We want to continue to collect upvotes and scenarios for this experience, so I've edited the description to help us do so.

Some of the additional scenarios we have heard regarding this are:

1. Wanting to download a NuGet package to run security health checks with (See https://github.com/ossf/scorecard)
2. Wanting to download a NuGet package without a dummy .csproj / project system attachment.
3. Wanting to download a NuGet package as the equivalent of NuGet.org's raw nupkg download (i.e. Download package)
4. Wanting to download a NuGet package without any client or server-side validation performed.
5. Wanting to download a NuGet package similar to nuget.exe install <packageid> -OutputDirectory <directory>, npm install <package id> --prefix <prefix>, pip install <package id> --target <target>, etc.

Please feel free to share your scenarios if you're reading this comment!

Also related to #6849

[vlm---]

Ours is scenario no. 3: pure downloading of newest packages by name to populate a feed in an offline environment.

[deitry]

Ours is no.5. We use GitHub NuGet private registry for binaries distribution, and specifically we have to download packages and extract binaries for Unity project. Sadly, Unity can not handle it by internal package management system, neither does NuGetForUnity.