nixos/matrix-synapse: mergeable log configuration

Right now there's no trivial way to override parts of synapse's log
config such as the log-level because the only thing that's changeable is
the path to the log-file used by synapse and its workers.

Now, there's a new option called `services.matrix-synapse.log`
which contains the default log config as Nix attribute-set (except
`handlers.journal.SYSLOG_IDENTIFIER`). It has default priority, so new
things can be added like

    services.matrix-synapse.log = {
      my.extra.field = 23;
    }

without discarding the rest. If desired, this can still be done via
`lib.mkForce`.

If the log configuration for a single worker or synapse, but not all
workers should be changed, `services.matrix-synapse.settings.log_config`
or `services.matrix-synapse.workers._name_.worker_log_config`
can be used.

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