mm: Internal transfers

This diff updates the market maker to attempt to reallocate available funds
to bots before doing a deposit or a withdrawal. For example, if a deposit
is required, and the user has additional available funds on the CEX that are
not allocated to any bots, funds will be allocated to the bot on the CEX
and unallocated from the bot on the wallet to simulate a deposit. Bots may
be configured to only attempt these "internal transfers", to attempt both
internal and external transfers, or to do no rebalancing at all.

client/mm/config.go

@@ -47,6 +47,10 @@ type CEXConfig struct {
 type AutoRebalanceConfig struct {
 	MinBaseTransfer  uint64 `json:"minBaseTransfer"`
 	MinQuoteTransfer uint64 `json:"minQuoteTransfer"`
+	// InternalOnly means that the bot will only simulate transfers by
+	// allocating unallocated funds to the bot's balance and never actually
+	// perform deposits and withdrawals with the CEX.
+	InternalOnly bool `json:"internalOnly"`
 }
 
 // BotBalanceAllocation is the initial allocation of funds for a bot.