[CodingStyle] Add AlternativeIfToBracketRector

[TomasVotruba]

Follow-up to #8157.

Adds AlternativeIfToBracketRector (CodingStyle) that converts the alternative if/elseif/else/endif control syntax to bracket syntax. Complements #8157, where ShortenElseIfRector now skips alternative syntax rather than producing broken mixed output — this rule lets you normalize such files to braces instead.

Change

-if ($value) :
+if ($value) {
     $result = 1;
-else :
+} else {
     $result = 2;
-endif;
+}

Full chain:

-if ($a) :
+if ($a) {
     $x = 1;
-elseif ($b) :
+} elseif ($b) {
     $x = 2;
-else :
+} else {
     $x = 3;
-endif;
+}

How

Detects alternative syntax with the same getOldTokens() scan used by the sibling CompleteMissingIfElseBracketRector (a : before { after the condition), then clears ORIGINAL_NODE on the if, its elseifs and else to force a bracket reprint. Bracket syntax is left untouched. Implements HTMLAverseRectorInterface so template files mixing inline HTML are skipped.

[samsonasik]

There is already rule for it: CompleteMissingIfElseBracketRector

rector-src/rules/CodeQuality/Rector/If_/CompleteMissingIfElseBracketRector.php

Line 22 in 52b57a6

final class CompleteMissingIfElseBracketRector extends AbstractRector implements HTMLAverseRectorInterface

[TomasVotruba]

It's slightly different rule. I could not find any fixture handling : there