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/channels/web/handlers.go

@@ -20,15 +20,15 @@ import (
 	"github.com/opentracing/opentracing-go/ext"
 	spanlog "github.com/opentracing/opentracing-go/log"
 
+	"github.com/mattermost/mattermost-server/server/public/model"
+	"github.com/mattermost/mattermost-server/server/public/shared/i18n"
+	"github.com/mattermost/mattermost-server/server/public/shared/mlog"
 	"github.com/mattermost/mattermost-server/server/v8/channels/app"
 	app_opentracing "github.com/mattermost/mattermost-server/server/v8/channels/app/opentracing"
 	"github.com/mattermost/mattermost-server/server/v8/channels/app/request"
 	"github.com/mattermost/mattermost-server/server/v8/channels/store/opentracinglayer"
 	"github.com/mattermost/mattermost-server/server/v8/channels/utils"
-	"github.com/mattermost/mattermost-server/server/v8/model"
 	"github.com/mattermost/mattermost-server/server/v8/platform/services/tracing"
-	"github.com/mattermost/mattermost-server/server/v8/platform/shared/i18n"
-	"github.com/mattermost/mattermost-server/server/v8/platform/shared/mlog"
 )
 
 func GetHandlerName(h func(*Context, http.ResponseWriter, *http.Request)) string {