create groupBy resolver + mock groupBy service (#14530)

To test :

```
query : 
query companiesGroupBy($groupBy: CompanyGroupByInput){
  companiesGroupBy(groupBy: $groupBy){
    groupByDimensionValues
    countEmptyId
    sumAnnualRecurringRevenueAmountMicros
    countEmptyAddress
    percentageEmptySearchVector
  }
}

input : 
{"groupBy": {"name": true, "employees": true, "domainName": {"primaryLinkUrl": true}}}

response : 
{
  "data": {
    "companiesGroupBy": [
      {
        "groupByDimensionValues": [
          "Text 1",
          "twenty.com",
          "1"
        ],
        "countEmptyId": 39,
        "sumAnnualRecurringRevenueAmountMicros": 20,
        "countEmptyAddress": 56,
        "percentageEmptySearchVector": 88
      },
      {
        "groupByDimensionValues": [
          "Long long long long and long text 2",
          "github.com/twentyhq/twenty",
          "2"
        ],
        "countEmptyId": 20,
        "sumAnnualRecurringRevenueAmountMicros": 56,
        "countEmptyAddress": 88,
        "percentageEmptySearchVector": 2
      },
      {
        "groupByDimensionValues": [
          "Text 3",
          "react.dev",
          "3"
        ],
        "countEmptyId": 56,
        "sumAnnualRecurringRevenueAmountMicros": 88,
        "countEmptyAddress": 2,
        "percentageEmptySearchVector": 39
      }
    ]
  }
}
```
closes https://github.com/twentyhq/core-team-issues/issues/1439

packages/twenty-server/src/engine/api/graphql/workspace-schema-builder/utils/get-resolver-args.util.ts

@@ -161,6 +161,27 @@ export const getResolverArgs = (
           isNullable: true,
         },
       };
+    case 'groupBy':
+      return {
+        groupBy: {
+          kind: GqlInputTypeDefinitionKind.GroupBy,
+          isNullable: false,
+          isArray: true,
+        },
+        filter: {
+          kind: GqlInputTypeDefinitionKind.Filter,
+          isNullable: true,
+        },
+        orderBy: {
+          kind: GqlInputTypeDefinitionKind.OrderBy,
+          isNullable: true,
+          isArray: true,
+        },
+        viewId: {
+          type: UUIDScalarType,
+          isNullable: true,
+        },
+      };
     default:
       throw new Error(`Unknown resolver type: ${type}`);
   }