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lyaml: fix alias serialization

The #8350 was introduced by the commit b42302f52ada ("lua-yaml: enable
aliasing for objects returned by __serialize") so the patch is
effectively reversed.

The idea is to call all object __serialize methods recursively before
finding references. The new serialization pass stores the mapping from
the original object to the serialized representation.

After this, the reference analysis pass and the encoding pass use this
mapping to replace original objects with the serialized representation.

As result, the reference analysis has a complete information about
objects and no references are missed.

Closes #8350
Closes #8310
Closes #8321

NO_DOC=bugfix

Co-authored-by: Nikolay Shirokovskiy <nshirokovskiy@tarantool.org>

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