If a batch gets bigger than a max size defined by the ethereum node
the raw transaction is sent to, the /ted/roller/send thread will crash and
the batch will be blocked, stopping any subsequent batches to be sent.
This detects when the current batch reaches a certain threshold and only
includes transactions up to that point, moving the ones that are not sent
back to the pending queue, adjusting their history and finding status.
This adds support for handling cases where the send-batch thread failed,
mainly among them, a thread crash. One of the events that causes this
behavior is a ver low gas price for this L1 transaction.
Here we add support for manually bumping the price for such transaction,
and for increasing the default fallback gas-price, together with discarding
any malformed batch from the sending queue.
