Support Disjunctive Normal Form Types (DNF types) for PHP 8.2+

[clue]

We should support Disjunctive Normal Form Types (DNF types) for PHP 8.2+ (RFC: https://wiki.php.net/rfc/dnf_types):

$promise->otherwise(function ((A&B)|(C&D) $e) { }); // Promise v2
$promise->catch(function ((A&B)|(C&D) $e) { }); // Promise v3

• Support for union types (PHP 8+) has been added via Support union types and address deprecation of ReflectionType::getClass() (PHP 8+ / Promise v2) #198 (Promise v2) and Support union types and address deprecation of ReflectionType::getClass() (PHP 8+) #197 (Promise v3)
• Support for intersection types (PHP 8.1+) has been added via Support intersection types (PHP 8.1+ / Promise v2) #195 (Promise v2) and Support intersection types (PHP 8.1+ / ported from v2 to v3) #209 (Promise v3)
• The catch() method exists for Promise v3 only, the otherwise() method has been deprecated for Promise v3 via Add catch() and finally(), deprecate otherwise() and always() #208
• There's currently no support for DNF types in either Promise v2 or Promise v3. Support should be added by adding this feature to either version (preferable Promise v3) and then cherry-picking to the other version.
• Legacy Promise v1 is not affected as it does not have an otherwise() or catch() method that checks exception types.
• DNF types will be supported in PHP 8.2+ only which is scheduled to be released in November.
• Other than that, this project supports PHP 8.2+ just fine, see Update test suite to avoid deprecation notices for PHP 8.1+ #230 and [3.x] Test on PHP 8.2 #234

Input and PRs very much welcome! 👍