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/public/model/websocket_request.go

@@ -0,0 +1,36 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"github.com/mattermost/mattermost-server/server/public/shared/i18n"
+
+	"github.com/vmihailenco/msgpack/v5"
+)
+
+// WebSocketRequest represents a request made to the server through a websocket.
+type WebSocketRequest struct {
+	// Client-provided fields
+	Seq    int64          `json:"seq" msgpack:"seq"`       // A counter which is incremented for every request made.
+	Action string         `json:"action" msgpack:"action"` // The action to perform for a request. For example: get_statuses, user_typing.
+	Data   map[string]any `json:"data" msgpack:"data"`     // The metadata for an action.
+
+	// Server-provided fields
+	Session Session            `json:"-" msgpack:"-"`
+	T       i18n.TranslateFunc `json:"-" msgpack:"-"`
+	Locale  string             `json:"-" msgpack:"-"`
+}
+
+func (o *WebSocketRequest) Clone() (*WebSocketRequest, error) {
+	buf, err := msgpack.Marshal(o)
+	if err != nil {
+		return nil, err
+	}
+	var ret WebSocketRequest
+	err = msgpack.Unmarshal(buf, &ret)
+	if err != nil {
+		return nil, err
+	}
+	return &ret, nil
+}