Add `SerializationOptions` enum value `SupressNullValuedProperties` / enable the option to not output null values

[JohnLBevan]

Today I can run @{one=1;two=$null} | ConvertTo-Yaml producing the below output:

one: 1
two:

It would be good to have the ability to prevent the output of fields with null values, so callers can choose to toggle this behaviour where their inputs contain properties with null values instead of simply not containing those properties.

Desired behaviour: @{one=1;two=$null} | ConvertTo-Yaml -Options SupressNullValuedProperties would produce the output:

one: 1

[gabriel-samfira]

Hi @JohnLBevan

I opened a PR here:

• https://github.com/cloudbase/powershell-yaml/pull/137

Is this what you had in mind?

[JohnLBevan]

That's awesome / exactly what I was after; thank-you @gabriel-samfira