Load and calculate Destination of files for kustomize localize (#4652)

* Implement file localization for localize

Implement file localization for new command kustomize localize

* Patch file localization

Fix lint errors, address feedback, begin transition to file loader from
localizer

* Add Repo() to Loader

* Implement locLoader factory + cleanup

* Add domain to RepoSpec

Fix ssh relative url host parsing for non-github domain on the side

* Implement Load(), New(), Root(), Dst() for LocLoader

* Address repospec code review comments

* Address 1st round of code review feedback

* Address feedback #2

Removed localized path calculations to cover edge case and improve readability.

* Remove ldr Cleanup logging

* Address code review round #3

* Address code review feedback #4

api/internal/localizer/util_test.go

@@ -0,0 +1,18 @@
+// Copyright 2022 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package localizer //nolint:testpackage
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestUrlBase(t *testing.T) {
+	require.Equal(t, "repo", urlBase("https://github.com/org/repo"))
+}
+
+func TestUrlBaseTrailingSlash(t *testing.T) {
+	require.Equal(t, "repo", urlBase("github.com/org/repo//"))
+}