refactor(diff): allow custom printer funcs

when using deck as a lib, if we want to capture the operations logs (creations, updates, deletions), we need to reconfigure the global vars in the `cprint` package.
this is an issue if we want to do different deck operations in parallel.

this change introduce new parameters to the Syncer, to configure custom printer funcs, without depending on the `cprint` package.
Note that by default if no custom printer funcs are configured, the ones from the `cprint` package will be used - so no behaviour change.

diff/diff.go

@@ -51,6 +51,10 @@ type Syncer struct {
 	silenceWarnings bool
 	stageDelaySec   int
 
+	createPrintln func(a ...interface{})
+	updatePrintln func(a ...interface{})
+	deletePrintln func(a ...interface{})
+
 	kongClient    *kong.Client
 	konnectClient *konnect.Client
 
@@ -70,6 +74,10 @@ type SyncerOpts struct {
 	StageDelaySec   int
 
 	NoMaskValues bool
+
+	CreatePrintln func(a ...interface{})
+	UpdatePrintln func(a ...interface{})
+	DeletePrintln func(a ...interface{})
 }
 
 // NewSyncer constructs a Syncer.
@@ -85,6 +93,20 @@ func NewSyncer(opts SyncerOpts) (*Syncer, error) {
 		stageDelaySec:   opts.StageDelaySec,
 
 		noMaskValues: opts.NoMaskValues,
+
+		createPrintln: opts.CreatePrintln,
+		updatePrintln: opts.UpdatePrintln,
+		deletePrintln: opts.DeletePrintln,
+	}
+
+	if s.createPrintln == nil {
+		s.createPrintln = cprint.CreatePrintln
+	}
+	if s.updatePrintln == nil {
+		s.updatePrintln = cprint.UpdatePrintln
+	}
+	if s.deletePrintln == nil {
+		s.deletePrintln = cprint.DeletePrintln
 	}
 
 	err := s.init()
@@ -383,19 +405,19 @@ func (sc *Syncer) Solve(ctx context.Context, parallelism int, dry bool) (Stats,
 			if err != nil {
 				return nil, err
 			}
-			cprint.CreatePrintln("creating", e.Kind, c.Console(), diffString)
+			sc.createPrintln("creating", e.Kind, c.Console(), diffString)
 		case crud.Update:
 			diffString, err := generateDiffString(e, false, sc.noMaskValues)
 			if err != nil {
 				return nil, err
 			}
-			cprint.UpdatePrintln("updating", e.Kind, c.Console(), diffString)
+			sc.updatePrintln("updating", e.Kind, c.Console(), diffString)
 		case crud.Delete:
 			diffString, err := generateDiffString(e, true, sc.noMaskValues)
 			if err != nil {
 				return nil, err
 			}
-			cprint.DeletePrintln("deleting", e.Kind, c.Console(), diffString)
+			sc.deletePrintln("deleting", e.Kind, c.Console(), diffString)
 		default:
 			panic("unknown operation " + e.Op.String())
 		}