client/mm: Refactor bot balance tracking

- This diff updates the balance tracking for market making bots. Previously,
there was a fragile diff based accounting technique. Now, on each bot
action, including trades, withdrawals, and deposits, a pending action is
stored. This pending action is updated until it is complete, at which time
it is removed, and the "base" balance of the bot is updated. The bot
balances are calculated by adding the base balances of the bot to the
effects of all pending actions.

- The `wrappedCore` and `wrappedCEX` types are removed, and their functionalities
are combined into a `unifiedExchangeAdaptor`. This is useful because
pending deposits and pending withdrawals have balance effects on both
CEX and DEX balances. Each `unifiedExchangeAdaptor` listens to a core
notification stream, and the `MarketMaker` type no longer needs to. In
a future refactor, the bots themselves will no longer listen to the
core notification functionality, and all common functionalities can be
moved to the `unifiedExchangeAdaptor`.

- Previously, the fee assets of tokens were not taken into account, but
now they are.

- The Binance library now uses a different endpoint, `/api/v3/balances`,
to get balances. This is supported by the Binance testnet api, so
testbinance is no longer required for balances.

client/mm/config.go

@@ -49,6 +49,11 @@ type BotConfig struct {
 	QuoteBalanceType BalanceType `json:"quoteBalanceType"`
 	QuoteBalance     uint64      `json:"quoteBalance"`
 
+	BaseFeeAssetBalanceType  BalanceType `json:"baseFeeAssetBalanceType"`
+	BaseFeeAssetBalance      uint64      `json:"baseFeeAssetBalance"`
+	QuoteFeeAssetBalanceType BalanceType `json:"quoteFeeAssetBalanceType"`
+	QuoteFeeAssetBalance     uint64      `json:"quoteFeeAssetBalance"`
+
 	// Only applicable for arb bots.
 	CEXCfg *BotCEXCfg `json:"cexCfg"`