dotnet new - Option to create solution implicitly when project is created

When a new project is created, can we consider an option to create a new solution as well ?

I can think of two workflows for new project creation:

(a) Adding a new project to an existing cohort of projects (which may already contain a solution)
(b) Instantiating a brand new cohort of project(s), which could use a solution file for working with IDE.

I'm interested in improving the experience of the second (b) workflow, which works like this today:

```pwsh
dotnet new $template
dotnet new sln
dotnet sln add $project
// Use sln
```

I'd like to propose a switch addition to `dotnet new ` - `--create-solution | -sln` - which will much like `dotnet new sln`.

The updated `dotnet new` would look like this:

```powershell
dotnet new [--dry-run] [--force] [-lang|--language {"C#"|"F#"|VB}] [-sln|--create-solution]
[-n|--name ] [-o|--output ] [Template options]

dotnet new -h|--help
```

For example, `dotnet new classlib -sln` would generate `classlib.csproj` as well as `classlib.sln`, and `classlib.csproj` to `classllib.sln`.

Similar to `dotnet new sln`, if a solution file already exists in the location, an error would occur.