Add sdkserver.SetAnnotations()

[antiphp]

What type of PR is this?

Uncomment only one /kind <> line, press enter to put that in a new line, and remove leading whitespace from that line:

/kind breaking
/kind bug
/kind cleanup
/kind documentation

/kind feature

/kind hotfix
/kind release

What this PR does / Why we need it:

Provides the ability to set multiple annotations at once.

This is important if you want an atomic application of the annotations.

Without that, setting annotations is not atomic, so anyone watching for changes required a mechanism to find out when all annotations have been applied. Hard to do if the number of annotation varies.

Which issue(s) this PR fixes:

Closes #3835

Special notes for your reviewer:

Adding some notes in the related ticket around unsetting annotations and labels.

[agones-bot]

Build Failed 😭

Build Id: 6bf71540-b245-4e61-a9e4-b060d4c5a439

Status: FAILURE

• Cloud Build view
• Cloud Build log download

To get permission to view the Cloud Build view, join the agones-discuss Google Group.

[agones-bot]

Build Failed 😭

Build Id: 4be80e2b-ce52-4a3b-b113-ded3b0847aa4

Status: FAILURE

• Cloud Build view
• Cloud Build log download

To get permission to view the Cloud Build view, join the agones-discuss Google Group.

[agones-bot]

Build Failed 😭

Build Id: d5428209-06d1-4b09-8673-507abfd93b46

Status: FAILURE

• Cloud Build view
• Cloud Build log download

To get permission to view the Cloud Build view, join the agones-discuss Google Group.

[github-actions]

This PR exceeds the recommended size of 1000 lines. Please make sure you are NOT addressing multiple issues with one PR. Note this PR might be rejected due to its size.

[agones-bot]

Build Failed 😭

Build Id: d8486e17-18fa-48fc-ac9d-6a6fbfad2fa8

Status: FAILURE

• Cloud Build view
• Cloud Build log download

To get permission to view the Cloud Build view, join the agones-discuss Google Group.

[gongmax]

lint error

make: *** [Makefile:499: lint] Error 1
			      ^
			err = wait.PollImmediate(time.Second, 10*time.Second, func() (bool, error) {
pkg/sdkserver/localsdk_test.go:330:10: SA1019: wait.PollImmediate is deprecated: This method does not return errors from context, use PollUntilContextTimeout. Note that the new method will no longer return ErrWaitTimeout and instead return errors defined by the context package. Will be removed in a future release. (staticcheck)
// Copyright 2020 Google LLC All Rights Reserved.
sdks/go/sdk_test.go:131:23: cannot use &sdkMock{} (value of type *sdkMock) as "agones.dev/agones/pkg/sdk".SDKClient value in variable declaration: *sdkMock does not implement "agones.dev/agones/pkg/sdk".SDKClient (missing method SetAnnotations) (typecheck)
sdks/go/sdk_test.go:122:11: cannot use sm (variable of type *sdkMock) as "agones.dev/agones/pkg/sdk".SDKClient value in struct literal: *sdkMock does not implement "agones.dev/agones/pkg/sdk".SDKClient (missing method SetAnnotations)
sdks/go/sdk_test.go:106:11: cannot use sm (variable of type *sdkMock) as "agones.dev/agones/pkg/sdk".SDKClient value in struct literal: *sdkMock does not implement "agones.dev/agones/pkg/sdk".SDKClient (missing method SetAnnotations)
sdks/go/sdk_test.go:77:11: cannot use sm (variable of type *sdkMock) as "agones.dev/agones/pkg/sdk".SDKClient value in struct literal: *sdkMock does not implement "agones.dev/agones/pkg/sdk".SDKClient (missing method SetAnnotations)
sdks/go/sdk_test.go:36:11: cannot use sm (variable of type *sdkMock) as "agones.dev/agones/pkg/sdk".SDKClient value in struct literal: *sdkMock does not implement "agones.dev/agones/pkg/sdk".SDKClient (missing method SetAnnotations)
sdks/go/alpha.go:1: : # agones.dev/agones/sdks/go [agones.dev/agones/sdks/go.test]

[agones-bot]

Build Failed 😭

Build Id: afe1b1c2-f118-4317-91c2-144a4f4d046f

Status: FAILURE

• Cloud Build view
• Cloud Build log download

To get permission to view the Cloud Build view, join the agones-discuss Google Group.

[gongmax]

/gcbrun

[agones-bot]

Build Succeeded 🥳

Build Id: 04c928c9-b679-4dce-91f3-4e0622d4767c

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:1.44.0-dev-9113391
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.44.0-dev-9113391
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.44.0-dev-9113391-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.44.0-dev-9113391
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.44.0-dev-9113391
• Linux C++ SDK (build): agonessdk-1.44.0-dev-9113391-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.44.0-dev-9113391.zip

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

• https://9113391-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/4001/head:pr_4001 && git checkout pr_4001
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.44.0-dev-9113391