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.

mod/data/classes/output/template_editor_tools.php

@@ -190,7 +190,7 @@ class template_editor_tools implements templatable, renderable {
      * @param array $taglist the indexed array of taglists ($tag => $tagname)
      * @return array of optgroup data
      */
-    protected function get_optgroup_data (string $name, array $taglist): array {
+    protected function get_optgroup_data(string $name, array $taglist): array {
         $tags = [];
         foreach ($taglist as $tag => $tagname) {
             $tags[] = [