feat(datetime): add calendar picker (#23416)

resolves #19423

BREAKING CHANGE: The `ion-datetime` component has been revamped to use a new calendar style. As a result, some APIs have been removed. See https://github.com/ionic-team/ionic-framework/blob/master/BREAKING.md for more details.

core/src/components/buttons/readme.md

@@ -322,6 +322,19 @@ export default defineComponent({
 | `collapse` | `collapse` | If true, buttons will disappear when its parent toolbar has fully collapsed if the toolbar is not the first toolbar. If the toolbar is the first toolbar, the buttons will be hidden and will only be shown once all toolbars have fully collapsed.  Only applies in `ios` mode with `collapse` set to `true` on `ion-header`.  Typically used for [Collapsible Large Titles](https://ionicframework.com/docs/api/title#collapsible-large-titles) | `boolean` | `false` |
 
 
+## Dependencies
+
+### Used by
+
+ - [ion-datetime](../datetime)
+
+### Graph
+```mermaid
+graph TD;
+  ion-datetime --> ion-buttons
+  style ion-buttons fill:#f9f,stroke:#333,stroke-width:4px
+```
+
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