Add identifier and metadata for AppendedArrayItemTypeRule

[ruudk]

For my custom error formatter I want to display Array (%s) does not accept %s. errors in a different way.

At first, I did this by using a regex that takes out both variable parts.

But soon I realized that large ConstantArrayType can be truncated making it impossible to re-use the printed type.

phpstan-src/src/Type/Constant/ConstantArrayType.php

Lines 761 to 765 in 7b79884

	if ($truncate && count($items) > self::DESCRIBE_LIMIT) {
	$items = array_slice($items, 0, self::DESCRIBE_LIMIT);
	$values = array_slice($values, 0, self::DESCRIBE_LIMIT);
	$append = ', ...';
	}

Therefore I would like to add both types to the metadata. This way, I can detect this error based on identifier and take both types from the metadata.

[ondrejmirtes]

This rule has been superseded by re-implemented https://github.com/phpstan/phpstan-src/blob/master/src/Rules/Properties/TypesAssignedToPropertiesRule.php.

All issues that used to be reported by AppendedArrayItemTypeRule are now reported by TypesAssignedToPropertiesRule instead. The array rule is no longer part of any level and will be removed in 2.0.