fix(mobile): incorrect height of keyboard toolbar in ios (#8653)

### What Changes:
- Fix keyboard height calculation with the `KeyboardToolBarConfig.useScreenHeight = true`. More detials in: https://github.com/toeverything/blocksuite/pull/8645
- Add safe bottom padding for shrinked keyboard toolbar
- Add `VirtualKeyboard` polyfill. Close [AF-1573](https://linear.app/affine-design/issue/AF-1573/virtualkeyboard-polyfill-with-capacitor)
  - Since the `@capacitor/keyboard` dose not implement the `Keyboard.show()` method, this polyfill is not enabled now.

yarn.lock

@@ -606,6 +606,7 @@ __metadata:
     "@capacitor/cli": "npm:^6.1.2"
     "@capacitor/core": "npm:^6.1.2"
     "@capacitor/ios": "npm:^6.1.2"
+    "@capacitor/keyboard": "npm:^6.0.2"
     "@sentry/react": "npm:^8.0.0"
     "@types/react": "npm:^18.2.75"
     "@types/react-dom": "npm:^18.2.24"
@@ -2991,6 +2992,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@capacitor/keyboard@npm:^6.0.2":
+  version: 6.0.2
+  resolution: "@capacitor/keyboard@npm:6.0.2"
+  peerDependencies:
+    "@capacitor/core": ^6.0.0
+  checksum: 10/cef4cce5c703fd67ceed3f04736a6513e05423006a5b4571d88d07a5849b79fc9f1ec98759606b7498ec1b604e5ee7987e5e30e61e9835538a29238ffbe3b036
+  languageName: node
+  linkType: hard
+
 "@chromatic-com/storybook@npm:^3.0.0":
   version: 3.0.0
   resolution: "@chromatic-com/storybook@npm:3.0.0"