Modify interaction options and cluster source options optional

[KyllianGautier]

Modify interaction options are required in the constructor, but all others interactions have optional options.
Same case for the cluster source.

Describe the solution you'd like
Make the Modify interaction options and the cluster source options optional.

[mike-000]

Modify requires either source or features and throws an error "The modify interaction requires features, a source or a layer" if not supplied (the reference to layer seems to be outdated). Options should not be optional for Draw, a valid type is required. The docs for ClusterSource are incorrect as it also throws a runtime error if source is missing.

[KyllianGautier]

@mike-000 Oh that's true, thanks, I fixed on my side.

[mike-000]

I think the ClusterSource runtime error is a bug and the docs are correct as the error also occurs if the documented setSource(null) is used. That means no options are mandatory and the options parameter can be optional. I have created #15842 to fix that.