refactor(events): rename all Ionic events to start with ion

BREAKING CHANGES:

Renamed all Ionic events to start with `ion`. The following events were
renamed:

- **Checkbox**
  - `change` -> `ionChange`
- **DateTime**
  - `change` -> `ionChange`
  - `cancel` -> `ionCancel`
- **InfiniteScroll**
  - `infinite` -> `ionInfinite`
- **Menu**
  - `opening` -> `ionDrag`
  - `opened` -> `ionOpen`
  - `closed` -> `ionClose`
- **Option**
  - `select` -> `ionSelect`
- **Picker**
  - `change` -> `ionChange`
- **RadioButton**
  - `select` -> `ionSelect`
- **RadioGroup**
  - `change` -> `ionChange`
- **Refresher**
  - `refresh` -> `ionRefresh`
  - `pulling` -> `ionPull`
  - `start` -> `ionStart`
- **Searchbar**
  - `input` -> `ionInput`
  - `blur` -> `ionBlur`
  - `focus` -> `ionFocus`
  - `cancel` -> `ionCancel`
  - `clear` -> `ionClear`
- **Segment**
  - `change` -> `ionChange`
  - `select` -> `ionSelect`
- **Select**
  - `change` -> `ionChange`
  - `cancel` -> `ionCancel`
- **Slides**
  - `willChange` -> `ionWillChange`
  - `didChange` -> `ionDidChange`
  - `move` -> `ionDrag`
- **TabButton**
  - `select` -> `ionSelect`
- **Tab**
  - `select` -> `ionSelect`
- **Tabs**
  - `change` -> `ionChange`
- **Toggle**
  - `change` -> `ionChange`

Closes #6568

src/components/datetime/test/basic/index.ts

@@ -26,6 +26,14 @@ class E2EPage {
     'l\u00f8r'
   ];
 
+  onChange(ev) {
+    console.log("Changed", ev);
+  }
+
+  onCancel(ev) {
+    console.log("Canceled", ev);
+  }
+
 }