[AI assisted]: Improve system console statistics performance (#29899)

```release-note
NONE
```

Co-authored-by: Matthew Birtch <mattbirtch@gmail.com>

server/channels/db/migrations/migrations.list

@@ -255,6 +255,8 @@ channels/db/migrations/mysql/000128_create_scheduled_posts.down.sql
 channels/db/migrations/mysql/000128_create_scheduled_posts.up.sql
 channels/db/migrations/mysql/000129_add_property_system_architecture.down.sql
 channels/db/migrations/mysql/000129_add_property_system_architecture.up.sql
+channels/db/migrations/mysql/000130_system_console_stats.down.sql
+channels/db/migrations/mysql/000130_system_console_stats.up.sql
 channels/db/migrations/postgres/000001_create_teams.down.sql
 channels/db/migrations/postgres/000001_create_teams.up.sql
 channels/db/migrations/postgres/000002_create_team_members.down.sql
@@ -511,3 +513,5 @@ channels/db/migrations/postgres/000128_create_scheduled_posts.down.sql
 channels/db/migrations/postgres/000128_create_scheduled_posts.up.sql
 channels/db/migrations/postgres/000129_add_property_system_architecture.down.sql
 channels/db/migrations/postgres/000129_add_property_system_architecture.up.sql
+channels/db/migrations/postgres/000130_system_console_stats.down.sql
+channels/db/migrations/postgres/000130_system_console_stats.up.sql

server/channels/db/migrations/mysql/000130_system_console_stats.down.sql

@@ -0,0 +1 @@
+-- Nothing to do for MySQL

server/channels/db/migrations/mysql/000130_system_console_stats.up.sql

@@ -0,0 +1 @@
+-- Nothing to do for MySQL

server/channels/db/migrations/postgres/000130_system_console_stats.down.sql

@@ -0,0 +1,5 @@
+DROP MATERIALIZED VIEW IF EXISTS posts_by_team_day;
+
+DROP MATERIALIZED VIEW IF EXISTS bot_posts_by_team_day;
+
+DROP MATERIALIZED VIEW IF EXISTS file_stats;

server/channels/db/migrations/postgres/000130_system_console_stats.up.sql

@@ -0,0 +1,16 @@
+CREATE MATERIALIZED VIEW IF NOT EXISTS posts_by_team_day as
+SELECT to_timestamp(p.createat/1000)::date as day, COUNT(*) as num, teamid
+FROM posts p JOIN channels c on p.channelid=c.id
+GROUP BY day, c.teamid;
+
+CREATE MATERIALIZED VIEW IF NOT EXISTS bot_posts_by_team_day as
+SELECT to_timestamp(p.createat/1000)::date as day, COUNT(*) as num, teamid
+FROM posts p
+JOIN Bots b ON p.UserId = b.Userid
+JOIN channels c on p.channelid=c.id
+GROUP BY day, c.teamid;
+
+CREATE MATERIALIZED VIEW IF NOT EXISTS file_stats as
+SELECT COUNT(*) as num, COALESCE(SUM(Size), 0) as usage
+FROM fileinfo
+WHERE DeleteAt = 0;