Set up GitHub Actions CI for JavaScript#7

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GreyCat wants to merge 11 commits intomasterfrom js-gh-action

Commits on Aug 3, 2021

Added compilation of ksy->js, replaced "npm ci" with "npm install", removed duplicate installation of kaitai-struct-compiler
GreyCat
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Generate only for 3 languages for now, and be verbose
GreyCat
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Fix ksy compilation destination
GreyCat
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Commits on Aug 8, 2021

Fix ksc invocation, as per discussion
GreyCat
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