feat: add DOCLINGCORE_ALLOWED_PRIVATE_IPS setting to allow private IPs

[COTHSC]

Closes #599

Adds an optional "allowed_private_ips" to CoreSettings to specify safe internal IPs as described in the issue
Default behaviour is unchanged

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[JViktoRArtola]

Is there a planned release window for this? I’d be happy to help test or contribute if that would be useful.