DirectoryNotFoundException

[christianhelle]

Describe the bug
Code generation fails if the output folder doesn't exist

Support Key: ptbddgt

OpenAPI Specifications
https://petstore3.swagger.io/api/v3/openapi.json

Additional context:

$ refitter https://petstore3.swagger.io/api/v3/openapi.json --output ../Boom/Kaboom/GeneratedCode.cs

Exception message
Could not find a part of the path 'C:\Boom\Kaboom\GeneratedCode.cs'.

Stack trace

System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Boom\Kaboom\GeneratedCode.cs'.
at Microsoft.Win32.SafeHandles.SafeFileHandle.CreateFile(System.String fullPath, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.IO.FileOptions options) at offset 161
at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(System.String fullPath, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.IO.FileOptions options, System.Int64 preallocationSize) at offset 6
at System.IO.Strategies.OSFileStreamStrategy..ctor(System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.IO.FileOptions options, System.Int64 preallocationSize) at offset 49
at System.IO.Strategies.FileStreamHelpers.ChooseStrategyCore(System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.IO.FileOptions options, System.Int64 preallocationSize) at offset 24
at System.IO.Strategies.FileStreamHelpers.ChooseStrategy(System.IO.FileStream fileStream, System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.IO.FileOptions options, System.Int64 preallocationSize)
at System.IO.File.AsyncStreamWriter(System.String path, System.Text.Encoding encoding, System.Boolean append)
at System.IO.File.WriteAllTextAsync(System.String path, System.String contents, System.Text.Encoding encoding, System.Threading.CancellationToken cancellationToken) at offset 85
at Refitter.GenerateCommand.<ExecuteAsync>d__1.MoveNext() at offset 397 in /home/runner/work/refitter/refitter/src/Refitter/GenerateCommand.cs:line 45:col 13