ML.NET CLI support for F#

### System information

- **OS version/distro**: `Microsoft Windows [Version 10.0.19041.329]`
- **.NET Version (eg., dotnet --info)**:
```
.NET Core SDK (reflecting any global.json):
Version: 3.1.301
Commit: 7feb845744

Runtime Environment:
OS Name: Windows
OS Version: 10.0.19041
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\3.1.301\

Host (useful for support):
Version: 3.1.5
Commit: 65cd789777

.NET Core SDKs installed:
3.1.301 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.App 3.1.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download
```
### Issue

- **What did you do?**
Tried to generate F# project using mlnet CLI tool.
- **What happened?**
No such option, only C# projects.
- **What did you expect?**
An option to generate F# code.

### Source code / logs
```
mlnet --version
16.1.1+acd4a98c2ef0dd6575de234c00ddc4f48d1d4f75
```
Please paste or attach the code or logs or traces that would be helpful to diagnose the issue you are reporting.