feat(Stores): Make caching and access mandatory

[bartelink]

While the value of caching is most debatable for ESDB, in general forcing people to be explicit about their caching strategy is a nudge that's too important to give up

• It also makes the Cosmos and Dynamo implementations cleaner to follow
• Obviates the need for #399 (as Cosmos and Dynamo no longer need specific mapping of available strategies)

Following the logic to its conclusion, considering the Access Strategy should also not be considered a luxury for a non-top system.

• Adds an Unoptimized case for EventStore, EventStoreDb, MessageDb and SqlStreamStore

HT @nordfjord for driving the suggestion

[bartelink]

Love it! Next we'll do mandatory access strategies

rebase didn't even leave that as optional...

[nordfjord]

Merge it!