feat(module): add PlanForce to Module interface with stubs

internal/modules/themes/themes.go

@@ -4,6 +4,7 @@ package themes
 import (
 	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"io/fs"
 	"os"
@@ -113,3 +114,7 @@ func (m Module) Verify(ctx context.Context) error {
 	}
 	return nil
 }
+
+func (m Module) PlanForce(ctx context.Context) (module.Plan, error) {
+	return module.Plan{}, errors.New("PlanForce not implemented")
+}