Add "read_any_file" function

[francisbarton]

If a user wants to read a file that is not one of the current Big Four (parquet, rds, csv, json) we can provide a generic function to read the blob and allow the user to handle it from there.

[francisbarton]

read_azure_blob_to_raw?
read_azure_blob?

[francisbarton]

read_azure_file in the end