v3.3.4: fix optional param in contract client, add js/ts samples for contract client, fix e2e open interest limit test, update readme

test/contract/private.read.test.ts

@@ -71,11 +71,11 @@ describe('Private Contract REST API GET Endpoints', () => {
     );
   });
 
-  // Doesn't work on e2e test account, something about account state. Investigating with bybit.
-  it.skip('getOpenInterestLimitInfo()', async () => {
+  // Doesn't work on e2e test account. This endpoint throws this error if the account never opened a position before.
+  it('getOpenInterestLimitInfo()', async () => {
     expect(await api.getOpenInterestLimitInfo('ETHUSDT')).toMatchObject({
-      ...successResponseObjectV3(),
-      retMsg: 'ok',
+      retCode: API_ERROR_CODE.PARAMS_MISSING_OR_WRONG,
+      retMsg: expect.stringMatching(/OI group don't exist/gim),
     });
   });