feat(core): page info adapter for journal (#5561)

Page info adapter + schema.
Adapted for journal features.

![image](https://github.com/toeverything/AFFiNE/assets/584378/2731ed2b-a125-4d62-b658-f2aff49d0e17)

packages/frontend/core/src/utils/index.ts

@@ -1,3 +1,4 @@
 export * from './create-emotion-cache';
+export * from './intl-formatter';
 export * from './string2color';
 export * from './toast';

packages/frontend/core/src/utils/intl-formatter.ts

@@ -0,0 +1,17 @@
+const timeFormatter = new Intl.DateTimeFormat(undefined, {
+  timeStyle: 'short',
+});
+
+const dateFormatter = new Intl.DateTimeFormat(undefined, {
+  year: 'numeric',
+  month: 'short',
+  day: 'numeric',
+});
+
+export const timestampToLocalTime = (ts: string) => {
+  return timeFormatter.format(new Date(ts));
+};
+
+export const timestampToLocalDate = (ts: string) => {
+  return dateFormatter.format(new Date(ts));
+};