Add Auto Deposit

AutoDeposit is called by the bidder node to add a recurring deposit in the bidder registry. The bidder can specify the amount of ETH to be deposited in each window. The bidder can also specify the start window number for the deposit. If the start window number is not specified, the current block number is used to calculate the window number. If the block number is specified, the window number is calculated based on the block number. One it is enabled, the node will automatically deposit the specified amount in each window as well as withdraw the deposit from the previous window.