Supporting Dangling Ptr Detection via BackupRefPtr (disabled by default)

Enable Dangling Ptr Detection (DPD) via BackupRefPtr (BRP) (disabled by default)
and additional safety checks that are too expensive to have on by default.
Enable checking raw_ptr do not become dangling during their lifetime.
Write a fixed cookie pattern at the end of each allocation to ensure there is no OOB write.

Enable MTE in Android for enabled devices (flag disabled by default) (#2444)

BRP and MTE activate additional checks related to memory usage at the expense of
performance and increased memory usage, but guarantee the user that the browser
will not suffer from development errors related to memory management.