tarantool / tarantool / 12019

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lua: update index Lua objects on alter, do not replace

Before the patch on any space alter Tarantool recreates its
indexes leaving old index objects be invalid. To protect a user
from errors about accessing outdated index object fields lets
update it in place instead of creating a new one.

Closes #3285

25 of 25 new or added lines in 1 file covered. (100.0%)

38416 of 47089 relevant lines covered (81.58%)

895806.97 hits per line