Refactor CommandesAPI to return response and add error handling

[WillyReyno]

Took inspiration from PaiementsAPI to complete what was missing here. See #1

There's still an issue with with_details param which is set to boolean and then serialized as an int from the following code:

        $queryParams = array_merge($queryParams, ObjectSerializer::toQueryValue(
            $with_details,
            'withDetails', // param base name
            'boolean', // openApiType
            'form', // style
            true, // explode
            false // required
        ) ?? []);

The API returns the following error

{"errors":{"withDetails":["The value '1' is not valid."]}

Workaround is to force "true" or "false" as string in organizationsOrganizationSlugFormsFormTypeFormSlugItemsGet

[WillyReyno]

I'm closing this pull request for now as I found more and more missing data from the endpoint which makes it nearly unusable. I will open an issue with a comparison.