Allow permanent dataset layer rotation in dataset settings

[MichaelBuessemeyer]

This PR adds new settings to the dataset settings for each layer. A interface (still in design process) enables the user to set a affine transformation matrix by letting the user define angles for each axis around which the dataset should be rotated.

• https://___.webknossos.xyz

Steps to test:

• abc

TODOs / Problems:

• Design a visualization of the result. For some first ideas look at the issue #7334
• The rotation should be done around the center of the dataset. For this, a translation by the dataset center is needed
• The interface works by defining Euler angles. The problem is that Euler angles are not deterministic / there are multiple ways to express a certain rotation with different Euler angle values. See: https://stackoverflow.com/questions/32235395/does-euler-angles-quaternion-euler-angles-always-result-in-an-equivalent-r
  • This makes it hard to update the settings correctly -> a 180 degree rotation around y is equivalent to 180 on x and 180 on z axis :/
  • A solution for this is needed as the interface currently is pretty quirky.

Problems:

• Layer rotates out of the dataset bbox

Issues:

• fixes #7334

---

(Please delete unneeded items, merge only when none are left open)

• Updated changelog
• Updated migration guide if applicable
• Updated documentation if applicable
• Adapted wk-libs python client if relevant API parts change
• Removed dev-only changes like prints and application.conf edits
• Considered common edge cases
• Needs datastore update after deployment

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