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box: allow to close idle sessions by timeout

The timer runs in the IPROTO thread's event loop to keep the
implementation simple: no cross-thread coordination is needed.

Closes #12839

@TarantoolBot document
Title: New `session.users.<name>.idle_timeout` option
Since: Tarantool 3.8

A new declarative configuration option allows to close idle binary
sessions of a user automatically (by default, the feature is disabled).
`session.users.<name>.idle_timeout` is the idle timeout, in seconds, for
connections authenticated as the given user:

    session:
      users:
        alice:
          idle_timeout: 60
        bob:
          idle_timeout: 300

Behavior:

* A connection authenticated as the given user is closed automatically
  if it receives no data from the client for longer than the timeout.
  The client must reconnect or re-authenticate to resume.
* A timeout of zero disables the mechanism for that user.
* Connections with in-flight requests are not closed by this mechanism.
* The option is dynamically changeable at runtime, though active
  connections are not affected.

Root document: https://www.tarantool.io/en/doc/latest/reference/configuration/

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