Create storage_options and active_storage_url API

[davidhassell]

Description

Create storage_options and active_storage_url API so that they are not hardwired

Closes #177

Before you get started

• ☝ Create an issue to discuss what you are going to do

Checklist

• This pull request has a descriptive title and labels
• This pull request has a minimal description (most was discussed in the issue, but a two-liner description is still desirable)
• Unit tests have been added (if codecov test fails)
• Any changed dependencies have been added or removed correctly (if need be)
• All tests pass

[davidhassell]

Hi V - only one test fails ... and a "mock" think which I'll have to pass on to you!

[valeriupredoi]

this is cool, cheers @davidhassell 🍺 - my plan for this is:

• streamline and merge Get missing values and dtype without re-opening the dataset #180 first
• off the back of the new main, open a local PR (not messing about with forks)
• merge this in that
• add optional logon options for anon buckets integrated via this PR, when @markgoddard enables anon buckets in Reductionist
• plop a GH Actions test to test this and the anon bucket storage via the newly deployed Reductionist on @bnlawrence 's cloud machine
• merge
• then open a new PR allowing user specified config/logon options (bottom of the pile)

🍺

[valeriupredoi]

bugger - time to sort out conflicts now 😮‍💨

[valeriupredoi]

actually - too much time wasted fixing conflicts - gonna lift and drop from here, rather

[valeriupredoi]

many thanks, David! Closed via #182