Merge 'Add sqlean ipaddr extension' from EmNudge

Relatively simple one, although I notice we don't have a lot of testing
here. The extensions have all their tests in the python cli extension
tests. Do we want to keep it that way or motivate inline rust tests for
these modules?

Closes #1081

scripts/publish-crates.sh

@@ -8,5 +8,6 @@ cargo publish -p limbo_regexp
 cargo publish -p limbo_series
 cargo publish -p limbo_time
 cargo publish -p limbo_uuid
+cargo publish -p limbo_ipaddr
 cargo publish -p limbo_core
 cargo publish -p limbo