Prep for MS Teams plugin API (#25565)

* - columns added to ShareChannelRemotes: lastpostcreateat, lastpostupdateat
- SyncMsg and SyncResponse moved to `model` package
- field added to RemoteCluster struct: PluginID

* sync new posts before updated posts to ensure post order in MS Teams

* add plugid to remoteclusters table and store

* don't sync history by default

server/channels/db/migrations/postgres/000117_msteams_shared_channels.down.sql

@@ -0,0 +1,6 @@
+ALTER TABLE RemoteClusters DROP COLUMN IF EXISTS PluginID;
+
+ALTER TABLE SharedChannelRemotes DROP COLUMN IF EXISTS LastPostCreateAt;
+
+ALTER TABLE SharedChannelRemotes DROP COLUMN IF EXISTS LastPostCreateID;
+

server/channels/db/migrations/postgres/000117_msteams_shared_channels.up.sql

@@ -0,0 +1,6 @@
+ALTER TABLE RemoteClusters ADD COLUMN IF NOT EXISTS PluginID VARCHAR(190) NOT NULL DEFAULT '';
+
+ALTER TABLE SharedChannelRemotes ADD COLUMN IF NOT EXISTS LastPostCreateAt bigint NOT NULL DEFAULT 0;
+
+ALTER TABLE SharedChannelRemotes ADD COLUMN IF NOT EXISTS LastPostCreateID VARCHAR(26);
+