[OTE-150] Add a pessimistic store and allow for its use by updating interfaces and multistore implementation to support branching and locking.

[lcwik]

Description

[OTE-150] Add a pessimistic store and allow for its use by updating interfaces and multistore implementation to support branching and locking.

Added tests.

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• included the correct type prefix in the PR title
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[linear]

OTE-150 Pessimistic store that allows for locking across multiple keys

[github-actions]

@lcwik your pull request is missing a changelog!

[roy-dydx]

This is going to be annoying to maintain; I assume we can't self reference here?

[lcwik]

Yes it is annoying, not sure how to do it otherwise.

Only would need to update the store reference if you change files under store/ so it should be relatively limited.