Functions for working with IPv4 and IPv6 addresses

<!-- The inner content of the tags below are replaced at doc framework build time with docs generated from system.functions. Please do not modify or remove the tags. See: https://github.com/ClickHouse/clickhouse-docs/blob/main/contribute/autogenerated-documentation-from-source.md --> <!--AUTOGENERATED_START--> <!--AUTOGENERATED_END-->