GR: 3D, warn on invalid rotation or tilt

[t-bltg]

Invalid rotation or tilt are currently silently ignored in GR, I believe the user should be warned.

This is a wontfix from Plots.jl's side, users should open an issue or PR in https://github.com/sciapp/gr for supporting θ < 0 or θ > 90.

See https://gr-framework.org/julia-gr.html#GR.setspace-0880646251e9db0f5d16f4369795d314:

Angles of rotation and viewing angle must be specified between 0° and 90°.

Linked #3541.
Fixes #3445.
Fixes #1911.

[codecov]

Codecov Report

Merging #3590 (1ddc673) into master (bba971f) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3590      +/-   ##
==========================================
- Coverage   65.12%   65.03%   -0.09%     
==========================================
  Files          27       27              
  Lines        6660     6663       +3     
==========================================
- Hits         4337     4333       -4     
- Misses       2323     2330       +7     

Impacted Files	Coverage Δ
src/backends/gr.jl	88.65% <100.00%> (+0.03%)	⬆️
src/axes.jl	83.56% <0.00%> (-0.47%)	⬇️
src/recipes.jl	57.75% <0.00%> (-0.46%)	⬇️
src/layouts.jl	68.06% <0.00%> (-0.25%)	⬇️

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[BeastyBlacksmith]

what if we project the value in the feasible interval?

[t-bltg]

what if we project the value in the feasible interval?

We could, that would require flipping & mirroring logic, which I suspect to be 🤯 .
Maybe I'll do that when I'll have time 😉, although this is low right now on my todo list.
In the mean time, with this PR, we close 2 issues and we avoid piling up potential new issues on that matter.

[daschw]

I think it's fine to have this warning. We can think about projecting in a separate PR.

[hurricane007]

so basically this "issue" is due to the limitation of GR backend