MDL-65292 style: Fix all function declarations white space

This has been generated running the following Sniffs, all
them part of the Moodle's CodeSniffer standard:
- PSR12.Functions.ReturnTypeDeclaration
- PSR12.Functions.NullableTypeDeclaration
- moodle.Methods.MethodDeclarationSpacing
- Squiz.Whitespace.ScopeKeywordSpacing

All them are, exclusively, about correct spacing, so the changes
are, all them, only white space changes.

Only exceptions to the above are 3 changes what were setting the
return type in a new line, and, when that happens, the closing
parenthesis (bracket) has to go to the same line than the colon.

lib/classes/task/task_logger.php

@@ -38,7 +38,7 @@ interface task_logger {
      *
      * @return  bool
      */
-    public static function is_configured() : bool;
+    public static function is_configured(): bool;
 
     /**
      * Store the log for the specified task.
@@ -59,7 +59,7 @@ interface task_logger {
      *
      * @return  bool
      */
-    public static function has_log_report() : bool;
+    public static function has_log_report(): bool;
 
     /**
      * Get any URL available for viewing relevant task log reports.
@@ -67,5 +67,5 @@ interface task_logger {
      * @param   string      $classname The task class to fetch for
      * @return  \moodle_url
      */
-    public static function get_url_for_task_class(string $classname) : \moodle_url;
+    public static function get_url_for_task_class(string $classname): \moodle_url;
 }