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connpool: make filter() check connections in parallel

Connpool `filter()` method used to be executed synchronously in a
single thread. Thus the maximum evaluation time was `number of instances
* timeout`. This patch makes its execution parallel limiting the
evaluation time with `timeout`.

@TarantoolBot document
Title: Experimental.connpool: `filter()` now works faster

Now `connpool.filter()` checks the instance status in parallel, making
the function execution faster, especially in case there are unavailable
instances.

Closes #10286

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