Channel banner sql migrations (#30274)

* Adde MySQL and Postgres migrations

* Replaced select * with column names

* removed all * from channel SQL store

* cleanup

* Fixed a duplicate column

* cleanup

* Added migrations and store support

* WIP

* used channelname slice in a missed place

* Handled patch

* Added app level tests

* Added API layer tests

* Added API layer tests

* WIP

* converted to query builder

* cleanupo

* added not null and default constraints

* Fixed test

* fixed file name

* review fixes

* review fixes

* updated migration file

* fixed text

* Review fixes

server/channels/db/migrations/postgres/000133_add_channel_banner_fields.down.sql

@@ -0,0 +1 @@
+ALTER TABLE channels DROP COLUMN IF EXISTS bannerinfo;

server/channels/db/migrations/postgres/000133_add_channel_banner_fields.up.sql

@@ -0,0 +1 @@
+ALTER TABLE channels ADD COLUMN IF NOT EXISTS bannerinfo jsonb;