Expose PKCS7_get_octet_string and PKCS7_type_is_other

Add PKCS7_get_octet_string() and PKCS7_type_is_other() to the public interface.
Fixes #11139

Reviewed-by: Tim Hudson <tjh@o

Expose PKCS7_get_octet_string and PKCS7_type_is_other

Add PKCS7_get_octet_string() and PKCS7_type_is_other() to the public interface.
Fixes #11139

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/13059)

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