tarantool / go-storage / 26233039368

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locker: add Locker interface package and wire NewLocker into Storage

Add Locker (Lock/TryLock/Unlock/Key), Options + WithTTL +
ApplyOptions, sentinel errors (ErrLocked, ErrSessionExpired,
ErrLockReleased, ErrUnsupported), and DefaultTTL = 60s. Also add
Factory, the lightest "create a lock" surface, for components that
only need a binder to acquire locks without the full Storage handle.

Add NewLocker(ctx, name, opts...) (locker.Locker, error) to
driver.Driver and storage.Storage. Storage and Prefixed also expose
LockerFactory() locker.Factory, mirroring the recently added
TxFactory(). Prefixed.NewLocker scopes the lock name under the
wrapper's prefix — matches Tx / Range, prevents collisions across
distinct prefixes. Minor break for out-of-tree implementers of
Driver / Storage.

Part of #29

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