Move all Kind constants to its own package

See #11256

resources/kinds/kinds_test.go

@@ -0,0 +1,40 @@
+// Copyright 2023 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kinds
+
+import (
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+)
+
+func TestKind(t *testing.T) {
+	t.Parallel()
+	c := qt.New(t)
+	// Add tests for these constants to make sure they don't change
+	c.Assert(KindPage, qt.Equals, "page")
+	c.Assert(KindHome, qt.Equals, "home")
+	c.Assert(KindSection, qt.Equals, "section")
+	c.Assert(KindTaxonomy, qt.Equals, "taxonomy")
+	c.Assert(KindTerm, qt.Equals, "term")
+
+	c.Assert(GetKindMain("TAXONOMYTERM"), qt.Equals, KindTaxonomy)
+	c.Assert(GetKindMain("Taxonomy"), qt.Equals, KindTaxonomy)
+	c.Assert(GetKindMain("Page"), qt.Equals, KindPage)
+	c.Assert(GetKindMain("Home"), qt.Equals, KindHome)
+	c.Assert(GetKindMain("SEction"), qt.Equals, KindSection)
+
+	c.Assert(GetKindAny("Page"), qt.Equals, KindPage)
+	c.Assert(GetKindAny("Robotstxt"), qt.Equals, KindRobotsTXT)
+}