fix: rm deprecated class modules, clean up, rm indirection (#355)

* refactor: rm deprecations, clean up, rm indirection

* fix: singleton init not being fired when inserting function

* refactor and generic internal add

* deprecate a few things that i impusively added lol

test/core/ioc.test.ts

@@ -98,4 +98,16 @@ describe('ioc container', () => {
         container.ready();
         expect(dependency.init).toHaveBeenCalledTimes(1);
     })
+
+    it('should detect a key already exists', () => {
+        container.add({ '@sern/client': dependency2 });
+        expect(container.hasKey('@sern/client')).toBeTruthy()
+    })
+
+
+    it('should detect a key already exists', () => {
+        container.add({ '@sern/client': () => dependency2 });
+        expect(container.hasKey('@sern/client')).toBeTruthy()
+    })
+
 });