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config: add `connpool.idle_timeout` option

This patch adds a `connpool` configuration section and a
`connpool.idle_timeout` configuration option. It's used to configure the
timeout in seconds for closing unused connections established by
`connpool.filter()` and `connpool.call()`.

Closes #11670

@TarantoolBot document
title: connpool: support timeout to close idle connections

New function in `experimental.connpool()`.

```
connpool.set_idle_timeout(timeout)
```

Params:
* `timeout` (`integer`) -- specify a timeout (in seconds) in which the
  unused connections indirectly opened by the connpool methods are
  closed.

New configuration option `connpool.idle_timeout`.

A timeout (in seconds) in which the unused connections opened by
connpool indirectly would be closed.

Note: this option does not affect the connections opened by
`connpool.connect()` since in that case, the user has direct access to
the connection object.

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