tarantool / tarantool / 13804249098

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lua: rewrite `tuple_field_by_path()` in FFI

This refactoring allows us to fully take advantage of the JIT compiler
for the indexing tuple by the given path. The most common cases of
tuples containing strings or numbers are accessed 1.5-2.5 times faster.
The drawback is the field contains the cdata from the msgpack extensions
(like decimals). Their decoding still takes approximately the same time
(maybe 5% slower).

NO_CHANGELOG=performance improvement
NO_DOC=performance improvement
NO_TEST=performance improvement

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