Move version in apex_manifest

This is creating merge_conflict for wider incoming change.
By moving the version to the top and adding emptyline comment in the
json, we aim to facilitate the incoming topic to merge

Bug: 235892590
Ignore-AOSP-First: apex on internal only
Test: Build + TH
Merged-In: Ib198d65c7c653c6185120ec179f6c937b20ab51b
Change-Id: Ib198d65c7c653c6185120ec179f6c937b20ab51b