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/channel_view.go

@@ -0,0 +1,15 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+type ChannelView struct {
+	ChannelId                 string `json:"channel_id"`
+	PrevChannelId             string `json:"prev_channel_id"`
+	CollapsedThreadsSupported bool   `json:"collapsed_threads_supported"`
+}
+
+type ChannelViewResponse struct {
+	Status            string           `json:"status"`
+	LastViewedAtTimes map[string]int64 `json:"last_viewed_at_times"`
+}