fix: azure sas key url encoding

[roeap]

Description

The object store crate encode the sas key values internally. When passing in an already encoded sas key, they would get double encoded. Since sas keys acquired from the azure portal and azure storage explorer are encoded, and this is "ususally" how a user would get them we decode them before passign them to object store.

I was not completely sure what the desired bahvior should be, alternatively we could update the documentation, to show a sas keys from the portal should be handled.

import deltalake
from urllib.parse import unquote

storage_options = dict(account_name=storage_account, sas_token=unquote(sas))
dt = deltalake.DeltaTable(azure_uri, storage_options=storage_options)

Related Issue(s)

closes #910

Documentation

[dominik7680]

The proposed workaround

import deltalake
from urllib.parse import unquote

storage_options = dict(account_name=storage_account, sas_token=unquote(sas))
dt = deltalake.DeltaTable(azure_uri, storage_options=storage_options)

does not properly work in latest deltalake-0.6.4.
SIG section in the SAS token ends with %3D, which is = URL encoded

In result, PyDeltaTable is trying to access the URL with removed = from the end.
Ex.:
Original URL Suffix:

URL Suffix from the PyDeltaTableError: Signature fields not well formed. exception

[roeap]

That is correct. THis issue has been fixed in a previous PR that is on main, but not yet in the released python bindings. #1007