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 12326519530

Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 42 unchanged lines in 11 files lost coverage.
• Overall coverage decreased (-0.007%) to 64.773%

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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/packethandler.cc	1	72.35%
pdns/backends/gsql/gsqlbackend.hh	1	97.71%
pdns/recursordist/aggressive_nsec.cc	2	66.17%
pdns/tcpiohandler.cc	2	68.18%
modules/lmdbbackend/lmdbbackend.cc	2	73.49%
pdns/recursordist/test-syncres_cc2.cc	3	88.91%
pdns/tsigverifier.cc	3	77.22%
modules/gpgsqlbackend/spgsql.cc	3	67.94%
pdns/dnsdistdist/dnsdist-tcp.cc	8	75.74%
pdns/recursordist/ext/luawrapper/include/LuaContext.hpp	8	14.19%

Totals
Change from base Build 12316427950:	-0.007%
Covered Lines:	125910
Relevant Lines:	163532

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💛 - Coveralls