feat(core): add extended grip type

[rusxakep]

Added grip_type "extended", a reinforced grip is created with an extended outer arm to increase contact area and stability.

[kellervater]

Thanks for your contribution 🙇 I really hoped to see someone pick up on new grip types.

I do have some concerns though:

1. Since this extended grip adds to top and bottom, the lockpin body would hang in mid air and require supports to be printed. That would be a lot of waste. The alternative would be to print it upright which will harm stability as the layer lines run differently (I fear there would be more creep over time and/or easier break points). That said, it looks like a legit feature anyways. But I'd request documentation on these drawbacks. Ideally here.
2. Please adhere to the conventional commits standard with your commit messages as described in the contribution guide. You'd need to amend your commit message (something like feat(core): add extended grip type). Ideally you install and run the commit hooks as they validate all requirements being met. I also saw you manually modified the makerworld files. This is not necessary as the pre-commit hooks create proper exports from the parts files.
3. I also left some minor remarks in the code. One specifically regarding the distinguation between standard and extended (I fear there's a regression)

Let me know if you have any questions.

[rusxakep]

1. Since this extended grip adds to top and bottom, the lockpin body would hang in mid air and require supports to be printed. That would be a lot of waste. The alternative would be to print it upright which will harm stability as the layer lines run differently (I fear there would be more creep over time and/or easier break points). That said, it looks like a legit feature anyways. But I'd request documentation on these drawbacks

Modified 'extended' format to eliminate issues in 3D printing while maintaining the same reliability as 'standard'

[kellervater]

looks like a clean solution.
Thanks so much for taking my remarks into account.
absolutely LGTM 🚀
THANKS for your great contribution!

[kellervater]

@rusxakep the only thing you'd still need to do before we can merge it, is to run the pre-commit hooks locally (see failing CI job).
They will fix general file-endings and create the proper makerworld export files.

[rusxakep]

Done!

[kellervater]

perfect! thank you!