Typehint callable for schema manager

Modern phpdoc (at least the variants supported by phpstan and phpstorm) supports defining a callable's expected arguments, which can provide feedback to the caller and the user on the types of arguments.

Schema manager has 3 functions which take a closure which this can be applied to:
PHP:

/**
 * @param string $tableName
 * @param \Closure(Alter): void $toApply
 */
public function alterTable($tableName, \Closure $toApply)

/**
 * @param string  $tableName
 * @param \Closure(Create): void...

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