doc,test: add documentation and test on how to use addons in SEA #702

Job	Run time
Build slim tarball	1m 31s
aarch64-linux: with shared libraries	23m 24s
x86_64-linux: with shared libraries	27m 34s
x86_64-darwin: with shared libraries	41m 6s
aarch64-darwin: with shared libraries	22m 20s
	1h 55m 55s

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