Add IPinfoLite to support Lite API

[silvanocerza]

Same as other libraries I duplicated some code to add support for the Lite API.

I had to fix some existing tests first as they were failing.

[linear]

ENG-290 Add Lite API support to `ipinfo/ruby`

[silvanocerza]

I think we need to update the token secret, I don't have permissions to do that.

[max-ipinfo]

I think we need to update the token secret, I don't have permissions to do that.

Done. It should work now.

Re-running checks.

[max-ipinfo]

API tests are still not passing (https://github.com/ipinfo/ruby/actions/runs/15921375992/attempts/2):

IPinfoTest
  test_lookup_ip6                                                 FAIL (0.15s)
        Expected: "Hiroshima"
          Actual: "Osaka"
        /home/runner/work/ruby/ruby/test/ipinfo_test.rb:[12](https://github.com/ipinfo/ruby/actions/runs/15921375992/job/44943284550#step:6:13):in `assert_ip6'
        /home/runner/work/ruby/ruby/test/ipinfo_test.rb:160:in `block in test_lookup_ip6'
        /home/runner/work/ruby/ruby/test/ipinfo_test.rb:[15](https://github.com/ipinfo/ruby/actions/runs/15921375992/job/44943284550#step:6:16)8:in `each'
        /home/runner/work/ruby/ruby/test/ipinfo_test.rb:158:in `test_lookup_ip6'

[silvanocerza]

@max-ipinfo tests are green 👍