add package deltalake integration

[leo-schick]

Adds simple integration support for package deltalake:

It adds a class mara_storage.integrations.deltalake.DeltaTable which creates a deltalake.DeltaTable but supports in addition the following parameters:

• storage: the mara storage class or alias to be passed
• path: The path inside the storage.

When storage is used, you can create the table simply with the mara alias. Example:

from mara_storage.integrations.deltalake import DeltaTable

table = DeltaTable('sales/invoices', storage='lakehouse')  # where 'lakehouse' is your storage alias

# returns the parquet files in the delta table of the current version
print(table.files())

Open tasks

• Require Azure Storage to be merged: Add azure storage support #11
• Add Unit test
• Add documentation