feat!: use 1-indexing for PaginationNav

- fix(PaginationNav): make 'change' event emit after user interaction instead of reactive event

BREAKING CHANGE: use 1-indexing for PaginationNav component

docs/src/COMPONENT_API.json

@@ -8431,7 +8431,7 @@
           "kind": "let",
           "description": "Specify the current page index",
           "type": "number",
-          "value": "0",
+          "value": "1",
           "isFunction": false,
           "isFunctionDeclaration": false,
           "isRequired": false,

docs/src/pages/framed/PaginationNav/PaginationNavReactive.svelte

@@ -7,8 +7,8 @@
 <PaginationNav bind:page />
 
 <div style="margin: var(--cds-layout-01) 0">
-  <Button on:click="{() => (page = 0)}" disabled="{page === 0}">
-    Set page to 0
+  <Button on:click="{() => (page = 1)}" disabled="{page === 0}">
+    Set page to 1
   </Button>
 </div>