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_search.go

@@ -0,0 +1,23 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+const ChannelSearchDefaultLimit = 50
+
+type ChannelSearch struct {
+	Term                     string   `json:"term"`
+	ExcludeDefaultChannels   bool     `json:"exclude_default_channels"`
+	NotAssociatedToGroup     string   `json:"not_associated_to_group"`
+	TeamIds                  []string `json:"team_ids"`
+	GroupConstrained         bool     `json:"group_constrained"`
+	ExcludeGroupConstrained  bool     `json:"exclude_group_constrained"`
+	ExcludePolicyConstrained bool     `json:"exclude_policy_constrained"`
+	Public                   bool     `json:"public"`
+	Private                  bool     `json:"private"`
+	IncludeDeleted           bool     `json:"include_deleted"`
+	IncludeSearchById        bool     `json:"include_search_by_id"`
+	Deleted                  bool     `json:"deleted"`
+	Page                     *int     `json:"page,omitempty"`
+	PerPage                  *int     `json:"per_page,omitempty"`
+}