MM-32421: Extend channel sidebar category APIs for Plugins (#17821)

* extend plugin api with sidebar functionalities

* include generated mocks for tests

* bump up version requirements for plugin api

* update tag to 'ChannelSidebar'

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

plugin/api.go

@@ -450,6 +450,24 @@ type API interface {
 	// Minimum server version: 5.6
 	SearchChannels(teamID string, term string) ([]*model.Channel, *model.AppError)
 
+	// CreateChannelSidebarCategory creates a new sidebar category for a set of channels.
+	//
+	// @tag ChannelSidebar
+	// Minimum server version: 5.37
+	CreateChannelSidebarCategory(userID, teamID string, newCategory *model.SidebarCategoryWithChannels) (*model.SidebarCategoryWithChannels, *model.AppError)
+
+	// GetChannelSidebarCategories returns sidebar categories.
+	//
+	// @tag ChannelSidebar
+	// Minimum server version: 5.37
+	GetChannelSidebarCategories(userID, teamID string) (*model.OrderedSidebarCategories, *model.AppError)
+
+	// UpdateChannelSidebarCategories updates the channel sidebar categories.
+	//
+	// @tag ChannelSidebar
+	// Minimum server version: 5.37
+	UpdateChannelSidebarCategories(userID, teamID string, categories []*model.SidebarCategoryWithChannels) ([]*model.SidebarCategoryWithChannels, *model.AppError)
+
 	// SearchUsers returns a list of users based on some search criteria.
 	//
 	// @tag User