Introduce lazy computation of glueing domains.

[HechtiDerLachs]

As discussed with @simonbrandhorst .

[HechtiDerLachs]

It seems that something with Polymake is breaking the CI here. @benlorenz : Do you have an idea of what's going on here?

There will be more errors due to my code, but this might be something different, so I wanted to ask.

[benlorenz]

The breakage is "just" julia nightly and everything that depends on libjulia (GAP, CxxWrap, libsingular, libpolymake) fails to precompile due to JuliaLang/julia#49012.

Working on it: JuliaPackaging/Yggdrasil#6962

[codecov]

Codecov Report

Merging #2502 (6f183b9) into master (412927a) will increase coverage by 0.03%.
The diff coverage is 98.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2502      +/-   ##
==========================================
+ Coverage   72.91%   72.94%   +0.03%     
==========================================
  Files         406      406              
  Lines       53904    53962      +58     
==========================================
+ Hits        39306    39365      +59     
+ Misses      14598    14597       -1     

Impacted Files	Coverage Δ
experimental/Schemes/LazyGlueing.jl	97.95% <97.36%> (+24.27%)	⬆️
...raicGeometry/Schemes/Covering/Morphisms/Methods.jl	100.00% <100.00%> (ø)
.../AlgebraicGeometry/Schemes/Glueing/Constructors.jl	67.41% <100.00%> (-4.72%)	⬇️

... and 5 files with indirect coverage changes