Structured plan renderer: Introduce support for multiline and JSON strings (#32488)

* pause implementation

* change -> diff, value -> change

* add support for json and multiline strings to the primitive renderer

* goimports

* remove unused function

* go fmt

* address comments

internal/command/jsonformat/collections/map.go

@@ -0,0 +1,35 @@
+package collections
+
+import (
+	"github.com/hashicorp/terraform/internal/command/jsonformat/computed"
+	"github.com/hashicorp/terraform/internal/plans"
+)
+
+type ProcessKey func(key string) computed.Diff
+
+func TransformMap[Input any](before, after map[string]Input, process ProcessKey) (map[string]computed.Diff, plans.Action) {
+	current := plans.NoOp
+	if before != nil && after == nil {
+		current = plans.Delete
+	}
+	if before == nil && after != nil {
+		current = plans.Create
+	}
+
+	elements := make(map[string]computed.Diff)
+	for key := range before {
+		elements[key] = process(key)
+		current = CompareActions(current, elements[key].Action)
+	}
+
+	for key := range after {
+		if _, ok := elements[key]; ok {
+			// Then we've already processed this key in the before.
+			continue
+		}
+		elements[key] = process(key)
+		current = CompareActions(current, elements[key].Action)
+	}
+
+	return elements, current
+}