Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/config/migrations/postgres/000002_create_configuration_files.up.sql

@@ -0,0 +1,7 @@
+CREATE TABLE IF NOT EXISTS configurationfiles (
+    name VARCHAR(64),
+    data text NOT NULL,
+    createat bigint NOT NULL,
+    updateat bigint NOT NULL,
+    PRIMARY KEY (name)
+);