Prepare migration to monorepo

--HG--
branch : 6.0

.hgtags

@@ -8,3 +8,23 @@
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+0000000000000000000000000000000000000000 4.2.0
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+0000000000000000000000000000000000000000 4.4.0
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+0000000000000000000000000000000000000000 4.6.0
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+0000000000000000000000000000000000000000 4.8.0
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+0000000000000000000000000000000000000000 5.0.0
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+0000000000000000000000000000000000000000 5.2.0
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+0000000000000000000000000000000000000000 5.4.0
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+0000000000000000000000000000000000000000 5.6.0
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+0000000000000000000000000000000000000000 5.8.0
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+0000000000000000000000000000000000000000 6.0.0
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