feat(config) make timeout configurable for the kong client

[tharun208]

Signed-off-by: Tharun [email protected]

What this PR does / why we need it: make the timeout seconds configurable in cached_proxy_resolver

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #1291

Special notes for your reviewer:

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR

[CLAassistant]

All committers have signed the CLA.

[shaneutt]

Just one small thing with the unit test for your considerations but otherwise looking good 👍

[shaneutt]

Once CI is happy, I am happy 👍 🖖

[codecov]

Codecov Report

Merging #1401 (126d609) into next (54c8000) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             next    #1401      +/-   ##
==========================================
+ Coverage   55.08%   55.20%   +0.12%     
==========================================
  Files          42       42              
  Lines        3660     3661       +1     
==========================================
+ Hits         2016     2021       +5     
+ Misses       1493     1491       -2     
+ Partials      151      149       -2     

Impacted Files	Coverage Δ
...n/internal/proxy/clientgo_cached_proxy_resolver.go	67.96% <100.00%> (+4.23%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 54c8000...126d609. Read the comment docs.

[shaneutt]

The licensing CI failure is a misnomer, this change doesn't break licensing rules.

[tharun208]

this proxy_cache_resolver_test is flaky and this happens in my local too. can we address this in this same PR or a seperate one ?