[POC] add graphql query runner (#6747)

## Context
The goal is to replace pg_graphql with our own ORM wrapper (TwentyORM).
This PR tries to add some parsing logic to convert graphql requests to
send to the ORM to replace pg_graphql implementation.

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/engine/api/graphql/graphql-query-runner/errors/graphql-query-runner.exception.ts

@@ -0,0 +1,17 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class GraphqlQueryRunnerException extends CustomException {
+  code: GraphqlQueryRunnerExceptionCode;
+  constructor(message: string, code: GraphqlQueryRunnerExceptionCode) {
+    super(message, code);
+  }
+}
+
+export enum GraphqlQueryRunnerExceptionCode {
+  MAX_DEPTH_REACHED = 'MAX_DEPTH_REACHED',
+  INVALID_CURSOR = 'INVALID_CURSOR',
+  INVALID_DIRECTION = 'INVALID_DIRECTION',
+  UNSUPPORTED_OPERATOR = 'UNSUPPORTED_OPERATOR',
+  ARGS_CONFLICT = 'ARGS_CONFLICT',
+  FIELD_NOT_FOUND = 'FIELD_NOT_FOUND',
+}