Connections leak with SqlDistributedLockConnectionStrategy.Azure #14

SqlDistributedLock.Try aquired with Azure strategy creates instance of AzureSqlDistributedLock and invokes it's TryAquire/TryAquireAsync with no contextHandle argument thus opening a new connection using provided connectionString. However when the lock is released and component is disposed, connection opened by it is not disposed thus leading to a connecion leakage.

Since outside connection vs. opening new connection case is determined anyway by keeping "ownsKeepalive" field way to go could be passing an connection instance to the LockScope if connection is being opened and having it disposed together with LockScope instance.