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.

reportbuilder/classes/local/filters/number.php

@@ -111,7 +111,7 @@ class number extends base {
      * @param array $values
      * @return array array of two elements - SQL query and named parameters
      */
-    public function get_sql_filter(array $values) : array {
+    public function get_sql_filter(array $values): array {
         $operator = (int) ($values["{$this->name}_operator"] ?? self::ANY_VALUE);
 
         $value1 = $values["{$this->name}_value1"] ?? null;

reportbuilder/classes/local/filters/text.php

@@ -61,7 +61,7 @@ class text extends base {
      *
      * @return array of comparison operators
      */
-    private function get_operators() : array {
+    private function get_operators(): array {
         $operators = [
             self::ANY_VALUE => get_string('filterisanyvalue', 'core_reportbuilder'),
             self::CONTAINS => get_string('filtercontains', 'core_reportbuilder'),

reportbuilder/classes/local/helpers/report.php

@@ -406,7 +406,7 @@ class report {
      *
      * @deprecated since Moodle 4.1 - please do not use this function any more, {@see custom_report_column_cards_exporter}
      */
-    public static function get_available_columns(report_model $persistent) : array {
+    public static function get_available_columns(report_model $persistent): array {
         debugging('The function ' . __FUNCTION__ . '() is deprecated, please do not use it any more. ' .
             'See \'custom_report_column_cards_exporter\' class for replacement', DEBUG_DEVELOPER);
 

reportbuilder/classes/local/models/audience.php

@@ -43,7 +43,7 @@ class audience extends persistent {
      *
      * @return array
      */
-    protected static function define_properties() : array {
+    protected static function define_properties(): array {
         return [
             'reportid' => [
                 'type' => PARAM_INT,

reportbuilder/classes/local/models/schedule.php

@@ -78,7 +78,7 @@ class schedule extends persistent {
      *
      * @return array
      */
-    protected static function define_properties() : array {
+    protected static function define_properties(): array {
         return [
             'reportid' => [
                 'type' => PARAM_INT,