SIP-296: Otex/Cowswap Cross Asset Swaps

SIP-296 proposes adding the Otex cowswap solver contract 0x004f4b64c0a206f2d979229e28d322d1c50864a3 to the Direct Integration Manager with the below parameters:

{'currencyKey': 'sUSD',
 'dexPriceAggregator': '0x228bCc970003Ca7588337604AFD9Fc5d92bF1C8B',
 'atomicMaxVolumePerBlock': 10m$,
 'atomicExchangeFeeRate': 0}

{'currencyKey': 'sETH',
 'dexPriceAggregator': '0x228bCc970003Ca7588337604AFD9Fc5d92bF1C8B',
 'atomicMaxVolumePerBlock': 10m$,
 'atomicVolatilityUpdateThreshold': 10,
 'atomicExchangeFeeRate': 10 bp}

{'currencyKey': 'sBTC',
 'dexPriceAggregator': '0x228bCc970003Ca7588337604AFD9Fc5d92bF1C8B',
 'atomicMaxVolumePerBlock': 10m$,
 'atomicVolatilityUpdateThreshold': 10,
 'atomicExchangeFeeRate': 10 bp}