Update api.derive to use api.queryMulti (#911)

* session api.queryMulti

* Make a single subscription to retrieve all session info

* Adjustments

* WIP

* Seems mostly comprehensive, need to full test e2e

* e2e tests for operations

* Allow "create from empty"

* skip

* Remove comment

* Remove ancient ?'s

* Update types.ts

packages/api-derive/test/e2e/promise.spec.ts

@@ -47,4 +47,27 @@ describe.skip('derive e2e', () => {
       done();
     });
   });
+
+  it('retrieves all session info', (done) => {
+    let count = 0;
+
+    return api.derive.session.info((info) => {
+      console.error(JSON.stringify(info));
+
+      // 5 blocks only, then go our merry way
+      if (++count === 5) {
+        done();
+      }
+    });
+  });
+
+  it('retrieves the balances', (done) => {
+    return api.derive.balances.all('5FLSigC9HGRKVhB9FiEo4Y3koPsNmBmLJbpXg2mp1hXcS59Y', (balance) => {
+      console.error(JSON.stringify(balance));
+
+      if (balance.freeBalance.gtn(1)) {
+        done();
+      }
+    });
+  });
 });

packages/api-derive/test/e2e/rx.spec.ts

@@ -31,7 +31,6 @@ describe.skip('derive e2e', () => {
   // These derive.accounts tests only work on localhost, not the poc-3 URL
   // (and it is assuming it sent at least 1 tx)
   describe('derive.accounts', () => {
-
     describe('idAndIndex', () => {
       it('looks up AccountId & AccountIndex from AccountId', async (done) => {
         // @ts-ignore silence warning until we have static types here