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RCORE-1969 Fix bundled encrypted Realm regression (#7535)

* non-functional changes

* fix a regression opening a bundled encrypted Realm on a device with a different page size

* only request a page of memory if encryption is used

* fix several other issues in encrypted file portability due to a miscalculation

* add a stack trace to DecryptionFailed for debugging

* mmap produces page-aligned addresses. In order to run tests which simulate a different page_size we need to remove the assumption that mmap addresses are page-aligned.

* touchups

* cleanup

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