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/ddl/sqlite_sql_generator.php

@@ -397,7 +397,7 @@ class sqlite_sql_generator extends sql_generator {
      * @param xmldb_table $xmldb_table The xmldb_table object instance.
      * @return array Array of SQL statements to add one comment to the table.
      */
-    function getCommentSQL ($xmldb_table) {
+    function getCommentSQL($xmldb_table) {
         return array();
     }