tarantool / tarantool / 6437

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vinyl: start to track count of dumped statements

Need to ensure that update_optimize will work
after implementation of common memory level
for txv and vy_mems.

Problem is in primary index statements which
will be stored once and referenced in txv and vy_mem
so we can't optimize updates during a transaction
commit, otherwise the user will be able to access
old statements from not updated indexes.

This patch proposes to track optimization of updates
closer to the disk, using the dumped_statements metric.

Need for #1908

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