Add WasbIO / WasbFileSystem (Azure Blob Storage)

Azure Blob Storage can be accessed by using the wasb:// and wasbs:// protocols. This should be quite similar to the hdfs:// implementations already there.

We should just be able to use it like this:

 
```

(
p
| ReadFromText("yourcontainer@youraccount.blob.core.windows.net/test/sample.txt")

| WriteToText("output.txt", shard_name_template="", num_shards=0)
)

```

See:

 [1] [https://docs.microsoft.com/en-us/azure/hdinsight/hdinsight-hadoop-use-blob-storage](https://docs.microsoft.com/en-us/azure/hdinsight/hdinsight-hadoop-use-blob-storage)

 [2] [https://hadoop.apache.org/docs/current/hadoop-azure/index.html](https://hadoop.apache.org/docs/current/hadoop-azure/index.html)

 [3] [https://gerardnico.com/azure/wasb](https://gerardnico.com/azure/wasb)

Imported from Jira [BEAM-10103](https://issues.apache.org/jira/browse/BEAM-10103). Original Jira may contain additional context.
Reported by: epicfaace.