feat(12.2-02): add the datepicker field with server-side bounds and date list columns

- type: datepicker compiles the D-20 keys; format maps to displayFormat with WinterCMS's momentFormat table
- boot fails when the mode does not match the column's Go type (time.Time, lagoon.Date, lagoon.TimeOfDay)
- datepicker is a writable scalar field; minDate and maxDate are rechecked on save
- columns.yaml accepts type: date and type: time; Scanner/Valuer structs are columns, not relations
- conformance fixture carries date and datetime fields; README, forms and lists docs

modules/cabana/form_schema.go

@@ -23,7 +23,7 @@ var (
 	formFieldTypes = map[string]struct{}{
 		"text": {}, "textarea": {}, "number": {}, "checkbox": {},
 		"switch": {}, "dropdown": {}, "relation": {}, "relation-manager": {},
-		"widget": {}, "partial": {}, "fileupload": {},
+		"widget": {}, "partial": {}, "fileupload": {}, "datepicker": {},
 	}
 	formSpans = map[string]struct{}{
 		"left": {}, "right": {}, "full": {}, "auto": {}, "row": {},
@@ -39,6 +39,8 @@ var (
 		"mode": {}, "fileTypes": {}, "mimeTypes": {}, "maxFilesize": {},
 		"maxFiles": {}, "imageWidth": {}, "imageHeight": {},
 		"thumbOptions": {}, "useCaption": {}, "prompt": {},
+		"format": {}, "minDate": {}, "maxDate": {}, "yearRange": {},
+		"firstDay": {}, "twelveHour": {}, "ignoreTimezone": {},
 	}
 	// widgetKeys are valid only on `type: widget` (D-06).
 	widgetKeys = []string{"widget", "action", "fill"}
@@ -152,6 +154,7 @@ func (s *FormSchema) Localize(ctx context.Context, tr *phrasebook.Translator, pr
 		field.Fill = append([]string(nil), src.Fill...)
 		field.FileTypes = append([]string(nil), src.FileTypes...)
 		field.MimeTypes = append([]string(nil), src.MimeTypes...)
+		field.YearRange = append([]int(nil), src.YearRange...)
 		options, err := localizeOptions(ctx, tr, src, provider)
 		if err != nil {
 			return nil, err
@@ -431,6 +434,9 @@ func compileFieldNode(name string, node ast.Node) (FormField, error) {
 	if err := compileFileuploadKeys(typ, values, &field); err != nil {
 		return FormField{}, err
 	}
+	if err := compileDatepickerKeys(typ, values, &field); err != nil {
+		return FormField{}, err
+	}
 	if node, ok := values["required"]; ok {
 		field.Required, err = nodeBool(node)
 		if err != nil {