Add GameServer addresses to the allocation APIs

[zmerlynn]

Follow on from #3299:

• Add addresses to allocation proto and GameServerAllocation response
• Document address and addresses on GameServer reference page

Note to reviewer: Commits starting with make are auto-generated bits, you can skip them (probably)

Closes #3089
Next steps: I'm going to test this with IPv6 to verify, then likely write an integration guide (done in #3311), which should be enough to complete #3134

[agones-bot]

Build Succeeded 👏

Build Id: 07418272-9192-45b9-b80a-f03ed464c6d9

The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.34.0-dev-43a04b0-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.34.0-dev-43a04b0-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.34.0-dev-43a04b0-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.34.0-dev-43a04b0-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.34.0-dev-43a04b0-amd64
• Linux C++ SDK (build): agonessdk-1.34.0-dev-43a04b0-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.34.0-dev-43a04b0-amd64.zip

A preview of the website (the last 30 builds are retained):

• https://43a04b0-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3307/head:pr_3307 && git checkout pr_3307
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.34.0-dev-43a04b0-amd64

[roberthbailey]

Did a quick pass and lgtm. Will defer to others for a more thorough review.

[agones-bot]

Build Succeeded 👏

Build Id: 06ff31e6-751a-4f3b-a537-edcff0fec277

The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.34.0-dev-4ebeda4-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.34.0-dev-4ebeda4-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.34.0-dev-4ebeda4-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.34.0-dev-4ebeda4-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.34.0-dev-4ebeda4-amd64
• Linux C++ SDK (build): agonessdk-1.34.0-dev-4ebeda4-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.34.0-dev-4ebeda4-amd64.zip

A preview of the website (the last 30 builds are retained):

• https://4ebeda4-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3307/head:pr_3307 && git checkout pr_3307
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.34.0-dev-4ebeda4-amd64

[agones-bot]

Build Succeeded 👏

Build Id: ef13e5cd-ab60-451d-ad67-c8a24a8c9ef7

The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.34.0-dev-88f0ad8-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.34.0-dev-88f0ad8-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.34.0-dev-88f0ad8-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.34.0-dev-88f0ad8-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.34.0-dev-88f0ad8-amd64
• Linux C++ SDK (build): agonessdk-1.34.0-dev-88f0ad8-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.34.0-dev-88f0ad8-amd64.zip

A preview of the website (the last 30 builds are retained):

• https://88f0ad8-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3307/head:pr_3307 && git checkout pr_3307
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.34.0-dev-88f0ad8-amd64

[markmandel]

Looks good!

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gongmax, markmandel, zmerlynn

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