[Feat] - Add Operator-AVS Reward Split to Response

[surbhit14]

Added the field operatorSplitPercent to /operators and /operators/[address] routes to show the current Operator-AVS Reward Split value for active registrations

Response Structure

"avsRegistrations": [
                {
                    "avsAddress": "0x18343aa10e3d2f3a861e5649627324aead987adf",
                    "isActive": true,
                    "operatorSplitPercent": 10
                },
                {
                    "avsAddress": "0x870679e138bcdf293b7ff14dd44b70fc97e12fc0",
                    "isActive": false
                }
            ]