Add more DataTypes support for blobtrigger

Looks like only String, byte[], and POJO is supported for blobtrigger, so the entire blob contents are loaded into memory.

Is it possible that java worker adds datatype like `CloudBlockBlob`, to avoid loading huge blob into memory and leverage storage api? [Those types](https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-storage-blob#trigger---usage) seems only supported in c# function.