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sysprof: improve parser's memory footprint

This patch reduces sysprof's parser memory footprint,
by avoiding reading all callchains before collapsing them.
Instead of it, parser merges stacks immediately after
reading them and stores counts in a Lua table.

The `collapse.lua` module is purged as a result of the
patch, but it is left as a stub to keep the integrational
testing intact. This stub should be removed in the next
series.

Resolves tarantool/tarantool#8700

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