[kong] add hostAliases for deployment

[vincenthcui]

expose hostAliases to values.yaml to be able to inject host aliases
into containers, so that we can resolve additional domain name which
can't be looked-up directly from dns server.

What this PR does / why we need it:

What:
expose hostAliases to values.yaml to be able to inject host aliases into containers.

Why:
In some case we need resolve custom domain which can't be looked-up from dns server

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• PR is based off the current tip of the next branch and targets next, not main
• New or modified sections of values.yaml are documented in the README.md
• Title of the PR and commit headers start with chart name (e.g. [kong])

[CLAassistant]

All committers have signed the CLA.

[vincenthcui]

@rainest would you please help to review this pr?