Enable retaining and visualising the applied cloud mask

Since we have many options for the cloud mask, it would be useful to be able to retain and visualise the mask. [Currently it is dropped](https://github.com/earthdaily/earthdaily-python-client/blob/1a0e7074df695778d8e130d25d1da0230df7a244/earthdaily/earthdatastore/__init__.py#L1073)

Update: simply commenting out that `drop` statement doesn't result in the behaviour I was expecting, which was that the mask would be available