Add timezone value into $geoip2_time_zone variable

[math-nao]

What this PR does / why we need it:
This PR adds a timezone geoip2 variable $geoip2_time_zone according to a source ip. Applications looking for user timezone may get this value from nginx controller directly instead of using another geoip2 request.

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[k8s-ci-robot]

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[math-nao]

/assign @bowei

[aledbf]

@math-nao please don't assign PRs manually

[aledbf]

/ok-to-test

[aledbf]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, math-nao

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@c5334b2). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
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  Files             ?       88           
  Lines             ?     6602           
  Branches          ?        0           
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  Hits              ?     3881           
  Misses            ?     2290           
  Partials          ?      431

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