Support stream deletion?

[DaveAurionix]

Use case: large numbers of intentionally short-lived event streams, e.g. saga state.

POC/example: GivePenny@e0e4763

Worth forming a PR from a branch off ASOS master?

[ilivewithian]

Is this something which is likely to be considered? //cc @afscrome

[asos-andrewpotts]

Thank you @DaveAurionix for your contribution.

[asos-andrewpotts]

Added a pre-release implementation in the "delete" branch.

I'll wait for the DeleteAllItemsByPartitionKeyStream feature to go GA before releasing, as this will be the better solution as it avoids the read/delete operations not being atomic.