tarantool / tarantool / 10992940049 / 1

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box: check fiber slice in generic implementation of index count

`index.count()` may hang for too long in Vinyl if a substantial
consecutive hunk of the space is stored in memory. Let's add
a fiber slice check to it to prevent it from blocking the TX thread
for too long.

Closes #10553

NO_DOC=bug fix

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