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/channels/db/migrations/mysql/000028_create_tokens.up.sql

@@ -0,0 +1,23 @@
+CREATE TABLE IF NOT EXISTS Tokens (
+    Token varchar(64) NOT NULL,
+    CreateAt bigint(20),
+    Type varchar(64) DEFAULT NULL,
+    Extra text,
+    PRIMARY KEY (Token)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'Tokens'
+        AND table_schema = DATABASE()
+        AND column_name = 'Extra'
+        AND data_type != 'text'
+    ) > 0,
+    'ALTER TABLE Tokens MODIFY Extra text;',
+    'SELECT 1'
+));
+
+PREPARE alterIfExists FROM @preparedStatement;
+EXECUTE alterIfExists;
+DEALLOCATE PREPARE alterIfExists;