Expose experimental settings for dns

[jrhee17]

Motivation:

We received a report where it seemed like DNS nameservers do not correctly reflect changes in /etc/resolv.conf.
The following issue has been pointed out to be a likely culprit:
netty/netty#14364

Given that we don't release as often recently and the cause isn't very clear, I propose that we expose methods that might solve the issue.
servicetalk seems to have also applied a similar fix recently: https://github.com/apple/servicetalk/pull/3073/files.

Modifications:

• Expose datagramChannelStrategy which provides an option to create a channel per-resolution
• Expose socketChannelType so that users may use tcp-fallback in case resolution via udp doesn't work as expected
• Given that it is difficult to test these settings, added a basic regression test to ensure that applying the settings doesn't interfere with based DnsEndpointGroup functionality.

Result:

• Closes Consider exposing DnsNameResolverBuilder or DnsNameResolverBuilder#datagramChannelStrategy #6122
• You can now set datagramChannelStrategy which provides an option to create a channel per-resolution for DNS.

[github-actions]

🔍 Build Scan® (commit: 9b47a7a)

Job name	Status	Build Scan®
build-ubicloud-standard-16-jdk-8	✅	https://ge.armeria.dev/s/333jwnycxhe6k
build-ubicloud-standard-16-jdk-21-snapshot-blockhound	✅	https://ge.armeria.dev/s/t7d5se25emlf4
build-ubicloud-standard-16-jdk-17-min-java-17-coverage	✅	https://ge.armeria.dev/s/syvudeqpi4uce
build-ubicloud-standard-16-jdk-17-min-java-11	✅	https://ge.armeria.dev/s/p2szbtw5yn6iw
build-ubicloud-standard-16-jdk-17-leak	✅	https://ge.armeria.dev/s/7idxjv7gkekiu
build-ubicloud-standard-16-jdk-11	✅	https://ge.armeria.dev/s/37w4nlqzvbbqu
build-macos-latest-jdk-21	✅	https://ge.armeria.dev/s/f72nizgqfunds

[minwoox]

Thanks! 👍 👍 👍

[minwoox]

👍 👍 👍