Support packing and alignment in C data structures (RzTypes) properly

[XVilka]

As a follow up of https://github.com/rizinorg/rizin/pull/2230 discussion we should design and implement properly various arrangements of structures and unions that can be packed, aligned, and have other similar attributes.

[ret2libc]

To clarify for the future: the packad, aligned, etc. should be attributes of the structure itself and they should be computed without having to use a different API.

[stale[bot]]

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