feat(cli): add exp task logs (#19915)

Closes https://github.com/coder/internal/issues/894

cli/exp_task_logs.go

@@ -0,0 +1,73 @@
+package cli
+
+import (
+	"fmt"
+
+	"github.com/google/uuid"
+	"golang.org/x/xerrors"
+
+	"github.com/coder/coder/v2/cli/cliui"
+	"github.com/coder/coder/v2/codersdk"
+	"github.com/coder/serpent"
+)
+
+func (r *RootCmd) taskLogs() *serpent.Command {
+	formatter := cliui.NewOutputFormatter(
+		cliui.TableFormat(
+			[]codersdk.TaskLogEntry{},
+			[]string{
+				"type",
+				"content",
+			},
+		),
+		cliui.JSONFormat(),
+	)
+
+	cmd := &serpent.Command{
+		Use:   "logs <task>",
+		Short: "Show a task's logs",
+		Middleware: serpent.Chain(
+			serpent.RequireNArgs(1),
+		),
+		Handler: func(inv *serpent.Invocation) error {
+			client, err := r.InitClient(inv)
+			if err != nil {
+				return err
+			}
+
+			var (
+				ctx    = inv.Context()
+				exp    = codersdk.NewExperimentalClient(client)
+				task   = inv.Args[0]
+				taskID uuid.UUID
+			)
+
+			if id, err := uuid.Parse(task); err == nil {
+				taskID = id
+			} else {
+				ws, err := namedWorkspace(ctx, client, task)
+				if err != nil {
+					return xerrors.Errorf("resolve task %q: %w", task, err)
+				}
+
+				taskID = ws.ID
+			}
+
+			logs, err := exp.TaskLogs(ctx, codersdk.Me, taskID)
+			if err != nil {
+				return xerrors.Errorf("get task logs: %w", err)
+			}
+
+			out, err := formatter.Format(ctx, logs.Logs)
+			if err != nil {
+				return xerrors.Errorf("format task logs: %w", err)
+			}
+
+			_, _ = fmt.Fprintln(inv.Stdout, out)
+			return nil
+		},
+	}
+
+	formatter.AttachOptions(&cmd.Options)
+	return cmd
+}