We implement a cursor based pagination model
to page through the posts in a given thread.
The cursor is a combination of the post.CreateAt+
post.Id to differentiate multiple posts in a given
timestamp.
Some additional parameters like direction, fromPost,
fromCreateAt and perPage were introduced to implement
this.
```release-note
NONE
```
Remote Cluster Service
- provides ability for multiple Mattermost cluster instances to create a trusted connection with each other and exchange messages
- trusted connections are managed via slash commands (for now)
- facilitates features requiring inter-cluster communication, such as Shared Channels
Shared Channels Service
- provides ability to shared channels between one or more Mattermost cluster instances (using trusted connection)
- sharing/unsharing of channels is managed via slash commands (for now)
