feat: implement pdip footprint

[Heyzerohey]

Closes #371

/claim #371

[Heyzerohey]

Hi! All CI checks are 100% green and passing.

This PR implements the PDIP (Plastic Dual In-line Package) footprint generator, closing #371. It registers full support for standard PDIP footprints (such as PDIP-8) and includes comprehensive tests.

Could we please get this reviewed and merged? Thank you!

[Heyzerohey]

Hi @seveibar! Polite follow-up on this PR. All CI checks are fully green and passing. It cleanly implements the PDIP footprint generator (closing #371) by extending the core DIP footprint logic safely. Could you please take a quick look when you have a moment? Thank you so much!

[rushabhcodes]

you are checking agains DIP, why

[Heyzerohey]

Hi @rushabhcodes! PDIP (Plastic Dual In-line Package) footprints share the exact same dimensions and pin pitch as standard DIP packages. In official KiCad libraries, there is no separate "PDIP-8" footprint; it is standardized under "DIP-8_W7.62mm". Therefore, comparing against it is the correct way to assert parity.

[Heyzerohey]

Hi @seveibar! Polite follow-up on this PR. It has been fully green on CI for 11 days. It cleanly implements the PDIP footprint by extending the core DIP logic safely. Could you please take a look when you have a moment? Thank you!