feat: add timezone support on date fields (#10896)

Adds support for timezone selection on date fields.

### Summary

New `admin.timezones` config:

```ts
{
  // ...
  admin: {
    // ...
    timezones: {
      supportedTimezones: ({ defaultTimezones }) => [
        ...defaultTimezones,
        { label: '(GMT-6) Monterrey, Nuevo Leon', value: 'America/Monterrey' },
      ],
      defaultTimezone: 'America/Monterrey',
    },
  }
}
```

New `timezone` property on date fields:

```ts
{
  type: 'date',
  name: 'date',
  timezone: true,
}
```

### Configuration

All date fields now accept `timezone: true` to enable this feature,
which will inject a new field into the configuration using the date
field's name to construct the name for the timezone column. So
`publishingDate` will have `publishingDate_tz` as an accompanying
column. This new field is inserted during config sanitisation.

Dates continue to be stored in UTC, this will help maintain dates
without needing a migration and it makes it easier for data to be
manipulated as needed. Mongodb also has a restriction around storing
dates only as UTC.

All timezones are stored by their IANA names so it's compatible with
browser APIs. There is a newly generated type for `SupportedTimezones`
which is reused across fields.

We handle timezone calculations via a new package `@date-fns/tz` which
we will be using in the future for handling timezone aware scheduled
publishing/unpublishing and more.

### UI

Dark mode

![image](https://github.com/user-attachments/assets/fcebdb7f-be01-4382-a1ce-3369f72b4309)

Light mode

![image](https://github.com/user-attachments/assets/dee2f1c6-4d0c-49e9-b6c8-a51a83a5e864)

test/fields/payload-types.ts

@@ -6,6 +6,60 @@
  * and re-run `payload generate:types` to regenerate this file.
  */
 
+/**
+ * Supported timezones in IANA format.
+ *
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "supportedTimezones".
+ */
+export type SupportedTimezones =
+  | 'Pacific/Midway'
+  | 'Pacific/Niue'
+  | 'Pacific/Honolulu'
+  | 'Pacific/Rarotonga'
+  | 'America/Anchorage'
+  | 'Pacific/Gambier'
+  | 'America/Los_Angeles'
+  | 'America/Tijuana'
+  | 'America/Denver'
+  | 'America/Phoenix'
+  | 'America/Chicago'
+  | 'America/Guatemala'
+  | 'America/New_York'
+  | 'America/Bogota'
+  | 'America/Caracas'
+  | 'America/Santiago'
+  | 'America/Buenos_Aires'
+  | 'America/Sao_Paulo'
+  | 'Atlantic/South_Georgia'
+  | 'Atlantic/Azores'
+  | 'Atlantic/Cape_Verde'
+  | 'Europe/London'
+  | 'Europe/Berlin'
+  | 'Africa/Lagos'
+  | 'Europe/Athens'
+  | 'Africa/Cairo'
+  | 'Europe/Moscow'
+  | 'Asia/Riyadh'
+  | 'Asia/Dubai'
+  | 'Asia/Baku'
+  | 'Asia/Karachi'
+  | 'Asia/Tashkent'
+  | 'Asia/Calcutta'
+  | 'Asia/Dhaka'
+  | 'Asia/Almaty'
+  | 'Asia/Jakarta'
+  | 'Asia/Bangkok'
+  | 'Asia/Shanghai'
+  | 'Asia/Singapore'
+  | 'Asia/Tokyo'
+  | 'Asia/Seoul'
+  | 'Australia/Sydney'
+  | 'Pacific/Guam'
+  | 'Pacific/Noumea'
+  | 'Pacific/Auckland'
+  | 'Pacific/Fiji'
+  | 'America/Monterrey';
 /**
  * This interface was referenced by `Config`'s JSON-Schema
  * via the `definition` "BlockColumns".
@@ -1081,6 +1135,29 @@ export interface DateField {
   dayOnly?: string | null;
   dayAndTime?: string | null;
   monthOnly?: string | null;
+  defaultWithTimezone?: string | null;
+  defaultWithTimezone_tz?: SupportedTimezones;
+  /**
+   * This date here should be required.
+   */
+  dayAndTimeWithTimezone: string;
+  dayAndTimeWithTimezone_tz: SupportedTimezones;
+  timezoneBlocks?:
+    | {
+        dayAndTime?: string | null;
+        dayAndTime_tz?: SupportedTimezones;
+        id?: string | null;
+        blockName?: string | null;
+        blockType: 'dateBlock';
+      }[]
+    | null;
+  timezoneArray?:
+    | {
+        dayAndTime?: string | null;
+        dayAndTime_tz?: SupportedTimezones;
+        id?: string | null;
+      }[]
+    | null;
   updatedAt: string;
   createdAt: string;
 }
@@ -2745,6 +2822,29 @@ export interface DateFieldsSelect<T extends boolean = true> {
   dayOnly?: T;
   dayAndTime?: T;
   monthOnly?: T;
+  defaultWithTimezone?: T;
+  defaultWithTimezone_tz?: T;
+  dayAndTimeWithTimezone?: T;
+  dayAndTimeWithTimezone_tz?: T;
+  timezoneBlocks?:
+    | T
+    | {
+        dateBlock?:
+          | T
+          | {
+              dayAndTime?: T;
+              dayAndTime_tz?: T;
+              id?: T;
+              blockName?: T;
+            };
+      };
+  timezoneArray?:
+    | T
+    | {
+        dayAndTime?: T;
+        dayAndTime_tz?: T;
+        id?: T;
+      };
   updatedAt?: T;
   createdAt?: T;
 }