Maximal angles between convex cones

[orlitzky]

My colleagues are writing about this stuff again. Let's migrate https://github.com/sagemath/sage/issues/29169 from the old Trac branch.

Relative to develop:

• Add a new reference
• Add a new module src.sage.geometry.cone_critical_angles for the implementation
• Add a max_angle() method to the class in src.sage.geometry.cone for the user interface

Relative to the old trac branch:

• Update the algorithm to take https://www.heldermann.de/JCA/JCA31/JCA311/jca31015.htm into consideration
• Add that paper as a reference
• Drop the more-general critical angles computation. It isn't nearly as nice as the maximal angle method.

TODO:

• Revert commit 95e57636c9 after checking the docs

[github-actions[bot]]

Documentation preview for this PR (built with commit 1b8f08f4d5932eacd60154c35414067fe80d3240; changes) is ready! :tada: This preview will update shortly after each push to this PR.

[orlitzky]

Thanks for the review!