refactor(core): use custom typing, remove interfaces

add protected, rename nav `remove` to `removeIndex`

resolves #12823

packages/core/src/components/input/input.tsx

@@ -200,7 +200,7 @@ export class Input implements InputComponent {
   }
 
 
-  ionViewDidLoad() {
+  protected ionViewDidLoad() {
     this.emitStyle();
 
     // By default, password inputs clear after focus when they have content

packages/core/src/components/input/textarea.tsx

@@ -182,7 +182,7 @@ export class Textarea implements TextareaComponent {
     }
   }
 
-  ionViewDidLoad() {
+  protected ionViewDidLoad() {
     this.emitStyle();
   }