[SDK] Implement ListStageCommands() in SDK

[t-kikuc]

What this PR does:

as title

Why we need it:

Enable handling commands without polling by a plugin developer

Which issue(s) this PR fixes:

Part of #5367

Example Usage

Approval:

func someApprovalStage(ctx context.Context, client *Client) {
	cnt := 0
	for cmd, err := range client.ListStageCommands(ctx, model.Command_APPROVE_STAGE) {
		if err != nil {
			lp.Error(...)
			break // or return error
		}
		cnt += 1 // validateApproverNum()

		if cnt > 10 {
			lp.Info("Received all required approvals")
			break
		}
	}
}

Skip:

	// Sync the skip command.
	var (
		status = model.StageStatus_STAGE_SUCCESS
		doneCh = make(chan struct{})
	)
	defer close(doneCh)
	go func() {
		for cmd, err := range client.__ListStageCommands(ctx, model.Command_APPROVE_STAGE){
			if err != nil{
				lp.Error(...)
				break // or return error 
			}
			if err == nil {
				status = model.StageStatus_STAGE_SKIPPED
				// Stop the context to cancel all running analyses.
				cancel()
				return
			}
		}

(cf.

pipecd/pkg/app/piped/executor/analysis/analysis.go

Lines 103 to 126 in 0a5f895

	// Sync the skip command.
	var (
	status = model.StageStatus_STAGE_SUCCESS
	doneCh = make(chan struct{})
	)
	defer close(doneCh)
	go func() {
	ticker := time.NewTicker(5 * time.Second)
	defer ticker.Stop()
	for {
	select {
	case <-ticker.C:
	if !e.checkSkippedByCmd(ctx) {
	continue
	}
	status = model.StageStatus_STAGE_SKIPPED
	// Stop the context to cancel all running analyses.
	cancel()
	return
	case <-doneCh:
	return
	}
	}
	}()

)

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[khanhtc1202]

LNeatTM 🔥

[t-kikuc]

We'll update the version of Go in another PR soon before merging the PR.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 45 lines in your changes missing coverage. Please review.

Project coverage is 25.43%. Comparing base (0a5f895) to head (e95e38b).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/plugin/sdk/client.go	0.00%	31 Missing ⚠️
pkg/plugin/sdk/deployment.go	0.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5639      +/-   ##
==========================================
- Coverage   26.68%   25.43%   -1.26%     
==========================================
  Files         477      477              
  Lines       50777    50844      +67     
==========================================
- Hits        13552    12931     -621     
- Misses      36156    36908     +752     
+ Partials     1069     1005      -64     

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[Warashi]

Thank you!
I commented on comments and namings.

[Warashi]

Could you please add comments as others?

[t-kikuc]

Thank you, I fixed it on e95e38b

[Warashi]

We use PascalCase for naming.

Suggested change

	const (
	CommandType_APPROVE_STAGE CommandType = iota
	CommandType_SKIP_STAGE
	)
	const (
	CommandTypeApproveStage CommandType = iota
	CommandTypeSkipStage
	)

[t-kikuc]

Thank you, I fixed it on e95e38b

[Warashi]

LGTM

[t-kikuc]

@khanhtc1202 Sorry, please approve again 🙏 　I fixed nits

[khanhtc1202]

👌