Migrate network DNS context definition and DNS filter one

[Shikugawa]

Record and Query definitions in DNS Filter (e.g. Envoy::Extensions::UdpFilters::DnsFilter::DnsQueryRecord) overlap with definitions in Network namespace. There are many overlaps with definitions in the Network namespace, so there is a possibility to integrate them. This refactor is useful for supporting SRV record lookups in c-ares layer, since the SRV record structure is already defined in DnsFilter.

[snowp]

@envoyproxy/api-shepherds for comment

[Shikugawa]

I think we don't need any api change on this refactor.

[htuch]

CC @yanjunxiang-google who is working on #14310. This might be relevant when doing code level refactoring.

[yanjunxiang-google]

HI @Shikugawa,
As Harvey @htuch mentioned, I am working on $14310. The goal is to refactor Envoy DNS resolution and put it as an extension, so Envoy can link in different DNS libraries(c-ares, Apple, et. al) based on requirements.

I will put you as reviewer once I have the PR ready.

thanks,
Yanjun

[Shikugawa]

HI @Shikugawa,
As Harvey @htuch mentioned, I am working on $14310. The goal is to refactor Envoy DNS resolution and put it as an extension, so Envoy can link in different DNS libraries(c-ares, Apple, et. al) based on requirements.

I will put you as reviewer once I have the PR ready.

thanks,
Yanjun

Great. Thanks!

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