Document geoiplookup and expose GeoIPQueryAttribute to Lua

[BozhanL]

Short description

Document geoiplookup function (introduced in #6171). Closes #8597
Expose enum GeoIPQueryAttribute from geoipinterface.hh to Lua.

Checklist

I have:

• read the CONTRIBUTING.md document
• compiled this code
• tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)
• checked that this code was merged to master

[coveralls]

Pull Request Test Coverage Report for Build 12939092487

Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 35 unchanged lines in 9 files lost coverage.
• Overall coverage decreased (-0.02%) to 64.685%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pdns/lua-record.cc	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
pdns/recursordist/recursor_cache.cc	1	84.16%
pdns/recursordist/rec-tcpout.cc	3	61.9%
pdns/iputils.cc	3	56.07%
modules/gpgsqlbackend/spgsql.cc	3	67.94%
pdns/recursordist/pdns_recursor.cc	3	72.45%
pdns/recursordist/test-syncres_cc1.cc	5	89.84%
pdns/signingpipe.cc	5	85.79%
pdns/packethandler.cc	6	72.4%
pdns/dnsdistdist/dnsdist-carbon.cc	6	61.6%

Totals
Change from base Build 12927190209:	-0.02%
Covered Lines:	127811
Relevant Lines:	166473

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💛 - Coveralls