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config: use failover priorities in leader selection

Closes #10552

@TarantoolBot document
Title: Use priorities when bootstrapping replica in supervised mode

Now, when working in `replication.failover = supervised` mode the
instance priorities specified in the
`failover.replicasets.<replicaset-name>.priority` section are used
to select the bootstrap leader when using `bootstrap_strategy: auto`.
The replica with the highest priority is chosen as a bootstrap leader.
If there are more than one instance with the highest priority the first
one sorted by name alphabetically is chosen.

Example:
```yaml
replication:
  failover: supervised
failover:
  replicasets:
    replicaset-001:
      priority:
        instance-002: 5
        instance-003: -3
        instance-004: 5
```
Setting up the config like this will make Tarantool choose
`instance-002` as the bootstrap leader.

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