[Enhancement] QP Getters

[elpekenin]

Description

Currently you have to always query every piece of data, even if you only wanted one of them.

Soi, I find myself writing a little bit of boilerplate even if i just wanted to check the display's width to check if a text can fit on it.

uint16_t           width;
uint16_t           height;
painter_rotation_t rotation;
uint16_t           offset_x;
uint16_t           offset_y;
qp_get_geometry(device, &width, &height, &rotation, &offset_x,  &offset_y);

Note: While looking at the code i saw that you can pass NULL pointers to the function, which was not documented, i added it.

---

So, with the current implementation we can actually do

uint16_t width;
qp_get_geometry(device, &width, NULL, NULL, NULL, NULL);

.... but i find this code much less friendly, specially for beginners, thus the new API allows to simply

uint16_t width = qp_get_width(device);

While presserving the old API as a convenience wrapper to all of these getters

PS1: I know this adds some duplication and may make code harder to maintain (longer codebase), not ideal

PS2: Perhaps it could be done the other way around, with new getters calling the "everything" one and returning the value we want, however this would lead to needing many changes if a new parameter is added that can be queried (all the get_* would need an extra NULL to the call). And i feel like breaking the logic into smaller function is a better idea anyway

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).