Add `bundleDate`, `bundleIdentifier` to `StatsigUser` (#4199)
* record event for fetched ota update
* Revert "record event for fetched ota update"
This reverts commit 4b49efe036c0c9605eabf1d5715586d093d60e9e.
* add `bundleDate` to `StatsigUser`
* include `bundleIdentifier` too
* move to `custom`