hidi transform creates an extensionless `output` file

[MaximRouiller]

Steps to reproduce

hidi transform --inlineLocal -d https://raw.githubusercontent.com/Azure/azure-rest-api-specs/main/specification/resources/resource-manager/Microsoft.Resources/stable/2021-04-01/resources.json

Expected result

Have a default file with the extension associated with the format it contains (output.json or output.yaml)

Actual result

File called output without any extension.

[CarolKigoonya]

We will set the extension based on the output format (this is determined by the input)

[MaggieKimani1]

As @CarolKigoonya has mentioned, we can infer the file format from the input file extension and use it as a default for when an output path is not provided.
Currently, we default to ./output