RFC - json_validate() (#9399)

* Add `json_validate(string $json, int $depth = 512, int $flags = 0): bool` from https://wiki.php.net/rfc/json_validate
* In json_validate, use a different

RFC - json_validate() (#9399)

* Add `json_validate(string $json, int $depth = 512, int $flags = 0): bool` from https://wiki.php.net/rfc/json_validate
* In json_validate, use a different set of C no-op functions for creating/updating
arrays/objects when validating while reusing the unmodified parser/scanner code
* Forbid unsupported flags in json_validate()
* Remove test of passing NULL as parameter (normal behavior of https://wiki.php.net/rfc/deprecate_null_to_scalar_internal_arg for internal functions)

Co-authored-by: jcm <juan.carlos.morales@tradebyte.com>

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