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/graphql-query-runner/graphql-query-runner.module.ts

@@ -13,6 +13,7 @@ import { GraphqlQueryDestroyOneResolverService } from 'src/engine/api/graphql/gr
 import { GraphqlQueryFindDuplicatesResolverService } from 'src/engine/api/graphql/graphql-query-runner/resolvers/graphql-query-find-duplicates-resolver.service';
 import { GraphqlQueryFindManyResolverService } from 'src/engine/api/graphql/graphql-query-runner/resolvers/graphql-query-find-many-resolver.service';
 import { GraphqlQueryFindOneResolverService } from 'src/engine/api/graphql/graphql-query-runner/resolvers/graphql-query-find-one-resolver.service';
+import { GraphqlQueryGroupByResolverService } from 'src/engine/api/graphql/graphql-query-runner/resolvers/graphql-query-group-by-resolver.service';
 import { GraphqlQueryMergeManyResolverService } from 'src/engine/api/graphql/graphql-query-runner/resolvers/graphql-query-merge-many-resolver.service';
 import { GraphqlQueryRestoreManyResolverService } from 'src/engine/api/graphql/graphql-query-runner/resolvers/graphql-query-restore-many-resolver.service';
 import { GraphqlQueryRestoreOneResolverService } from 'src/engine/api/graphql/graphql-query-runner/resolvers/graphql-query-restore-one-resolver.service';
@@ -35,6 +36,7 @@ const graphqlQueryResolvers = [
   GraphqlQueryFindDuplicatesResolverService,
   GraphqlQueryFindManyResolverService,
   GraphqlQueryFindOneResolverService,
+  GraphqlQueryGroupByResolverService,
   GraphqlQueryMergeManyResolverService,
   GraphqlQueryRestoreManyResolverService,
   GraphqlQueryRestoreOneResolverService,