MM-55295: Improve DB performance of some (Take 2) (#25865)

* Revert "Revert "MM-55295: Improve DB performance of some APIs (#25318)" (#25852)"

This reverts commit 077221a940.

* Fix the issue

```release-note
NONE
```

* lint fix

```release-note
NONE
```

server/channels/store/store.go

@@ -205,7 +205,7 @@ type ChannelStore interface {
 	GetDeleted(team_id string, offset int, limit int, userID string) (model.ChannelList, error)
 	GetChannels(teamID, userID string, opts *model.ChannelSearchOpts) (model.ChannelList, error)
 	GetChannelsByUser(userID string, includeDeleted bool, lastDeleteAt, pageSize int, fromChannelID string) (model.ChannelList, error)
-	GetAllChannelMembersById(id string) ([]string, error)
+	GetAllChannelMemberIdsByChannelId(id string) ([]string, error)
 	GetAllChannels(page, perPage int, opts ChannelSearchOpts) (model.ChannelListWithTeamData, error)
 	GetAllChannelsCount(opts ChannelSearchOpts) (int64, error)
 	GetMoreChannels(teamID string, userID string, offset int, limit int) (model.ChannelList, error)
@@ -227,6 +227,7 @@ type ChannelStore interface {
 	UpdateMemberNotifyProps(channelID, userID string, props map[string]string) (*model.ChannelMember, error)
 	GetMembers(channelID string, offset, limit int) (model.ChannelMembers, error)
 	GetMember(ctx context.Context, channelID string, userID string) (*model.ChannelMember, error)
+	GetMemberLastViewedAt(ctx context.Context, channelID string, userID string) (int64, error)
 	GetChannelMembersTimezones(channelID string) ([]model.StringMap, error)
 	GetAllChannelMembersForUser(userID string, allowFromCache bool, includeDeleted bool) (map[string]string, error)
 	GetChannelsMemberCount(channelIDs []string) (map[string]int64, error)