Add final_message_json tool and relax phase decision parser #47

Job	Run time
Web UI Gates	4m 26s
Build (x86_64-apple-darwin)	10m 18s
Build (x86_64-pc-windows-msvc)	18m 55s
Build (x86_64-unknown-linux-gnu)	9m 21s
Build (aarch64-apple-darwin)	5m 25s
Publish GitHub release (tags only)	10s
Publish to public repo (tags only)	12s
	48m 47s

Provide feedback