Add an "unpack" task to the stager-maven-plugin #708

Job	Run time
checkstyle	3m 20s
build	5m 1s
shellcheck	3m 5s
copyright	3m 12s
spotbugs	5m 48s
cli/linux-amd64	4m 43s
tests/cli-linux	4m 59s
cli/windows-amd64	5m 33s
javadoc	4m 0s
tests/cli-functional-linux	6m 34s
cli/darwin-amd64	6m 29s
vscode-ext	3m 53s
tests/archetype-linux	4m 54s
tests/linker-linux	4m 57s
tests/others-linux	5m 49s
tests/cli-windows	5m 49s
tests/cli-functional-windows	7m 4s
tests/archetype-windows	5m 28s
tests/linker-windows	5m 20s
tests/others-windows	7m 14s
cli/binaries	6s
tests/results	5s
gate	1s
	1h 43m 24s

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