Expose public/ API as submodule (#23345)

* model -> public/model

* plugin -> public/plugin

* public/model/utils -> public/utils

* platform/shared/mlog -> public/shared/mlog

* platform/shared/i18n -> public/shared/i18n

* platform/shared/markdown -> public/shared/markdown

* platform/services/timezones -> public/shared/timezones

* channels/einterfaces -> einterfaces

* expose public/ submodule

* go mod tidy

* .github: cache-dependency-path, setup-go-work

* modules-tidy for public/ too

* remove old gomodtidy

server/platform/services/imageproxy/atmos_camo_test.go

@@ -13,8 +13,8 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
+	"github.com/mattermost/mattermost-server/server/public/model"
 	"github.com/mattermost/mattermost-server/server/v8/channels/utils/testutils"
-	"github.com/mattermost/mattermost-server/server/v8/model"
 	"github.com/mattermost/mattermost-server/server/v8/platform/services/httpservice"
 )
 

server/platform/services/imageproxy/imageproxy.go

@@ -11,10 +11,10 @@ import (
 	"strings"
 	"sync"
 
-	"github.com/mattermost/mattermost-server/server/v8/model"
+	"github.com/mattermost/mattermost-server/server/public/model"
+	"github.com/mattermost/mattermost-server/server/public/shared/mlog"
 	"github.com/mattermost/mattermost-server/server/v8/platform/services/configservice"
 	"github.com/mattermost/mattermost-server/server/v8/platform/services/httpservice"
-	"github.com/mattermost/mattermost-server/server/v8/platform/shared/mlog"
 )
 
 var ErrNotEnabled = Error{errors.New("imageproxy.ImageProxy: image proxy not enabled")}

server/platform/services/imageproxy/local.go

@@ -19,7 +19,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/mattermost/mattermost-server/server/v8/platform/shared/mlog"
+	"github.com/mattermost/mattermost-server/server/public/shared/mlog"
 )
 
 var imageContentTypes = []string{

server/platform/services/imageproxy/local_test.go

@@ -13,8 +13,8 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
+	"github.com/mattermost/mattermost-server/server/public/model"
 	"github.com/mattermost/mattermost-server/server/v8/channels/utils/testutils"
-	"github.com/mattermost/mattermost-server/server/v8/model"
 	"github.com/mattermost/mattermost-server/server/v8/platform/services/httpservice"
 )