Add an "unpack" task to the stager-maven-plugin (#1073) #709

Job	Run time
copyright	3m 22s
shellcheck	3m 6s
checkstyle	3m 33s
build	5m 21s
javadoc	4m 9s
spotbugs	5m 52s
cli/linux-amd64	4m 46s
tests/cli-linux	4m 55s
cli/windows-amd64	5m 23s
vscode-ext	3m 57s
tests/cli-functional-linux	6m 32s
cli/darwin-amd64	5m 34s
tests/archetype-linux	4m 58s
tests/linker-linux	4m 45s
tests/others-linux	5m 53s
tests/cli-windows	6m 5s
tests/cli-functional-windows	7m 12s
tests/archetype-windows	5m 35s
tests/linker-windows	5m 19s
tests/others-windows	7m 15s
cli/binaries	5s
tests/results	6s
gate	1s
	1h 43m 44s

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