tarantool / tarantool / 13114

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Introduce blackhole engine

Blackhole is a very simple engine that allows to create spaces that may
written to, but not read from. It only supports INSERT/REPLACE requests.
It doesn't support any indexes hence SELECT is impossible. It does check
space format though and supports on_replace and before_replace triggers.

The whole purpose of this new engine is writing arbitrary rows to WAL
without storing them anywhere. In particular, we need this engine to
write deferred DELETEs generated for vinyl spaces to WAL.

Needed for #2129

60 of 60 new or added lines in 3 files covered. (100.0%)

39860 of 48691 relevant lines covered (81.86%)

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