Add memory profile build target (#1960)

* fix(cmd): Add profiling build imports

It seems like this file has been bitrotted since last used,
and it was missing some imports. This was discovered
by running goimports on the code.

* Add build-memprof Makefile target

internal/cmd/base/profiling_on.go

@@ -4,18 +4,21 @@
 package base
 
 import (
+	"context"
 	"os"
 	"path/filepath"
 	"runtime"
 	"runtime/pprof"
 	"time"
+
+	"github.com/hashicorp/boundary/internal/observability/event"
 )
 
 func StartMemProfiler(ctx context.Context) {
 	const op = "base.StartMemProfiler"
 	profileDir := filepath.Join(os.TempDir(), "boundaryprof")
 	if err := os.MkdirAll(profileDir, 0o700); err != nil {
-		event.WriteError(ctx, op, err, "could not create profile directory")
+		event.WriteError(ctx, op, err, event.WithInfoMsg("could not create profile directory"))
 		return
 	}
 
@@ -24,11 +27,11 @@ func StartMemProfiler(ctx context.Context) {
 			filename := filepath.Join(profileDir, time.Now().UTC().Format("20060102_150405")) + ".pprof"
 			f, err := os.Create(filename)
 			if err != nil {
-				event.WriteError(ctx, op, err, event.WithInfo("could not create memory profile"))
+				event.WriteError(ctx, op, err, event.WithInfoMsg("could not create memory profile"))
 			}
 			runtime.GC()
 			if err := pprof.WriteHeapProfile(f); err != nil {
-				event.WriteError(ctx, op, err, "could not write memory profile")
+				event.WriteError(ctx, op, err, event.WithInfoMsg("could not write memory profile"))
 			}
 			f.Close()
 			event.WriteSysEvent(ctx, op, "wrote memory profile", "filename", filename)