add CMD_DUMP_HEADER

[bignaux]

Pull Request checklist

Note: these are not necessarily requirements

• [ ] I reformatted the code with clang-format
• [ ] I checked to make sure my submission worked
• [ ] I am the author of submission or have permission from the original author
• [ ] Requires update of the PS2SDK
• [ ] Requires update of the gsKit
• [ ] Others (please specify below)

Pull Request description

The idea is mainly provide typedef struct ppaa_partition_type and looping method on ppa_files_name to serve as prototype for refactoring hdd_inject_header() and other copy/paste function.

[AKuHAK]

Boot.kirx also can be in the header