Assign an Id to windows

[Zoxc]

This assigns an Id to windows so that set_current_view can be used when creating the view for the window. This allows messages send during the view creation to be correctly delivered.

[codecov]

Codecov Report

Merging #131 (75fbb5f) into main (6f39d64) will decrease coverage by 0.03%.
Report is 1 commits behind head on main.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##            main    #131      +/-   ##
========================================
- Coverage   3.18%   3.16%   -0.03%     
========================================
  Files         54      54              
  Lines       9764    9832      +68     
========================================
  Hits         311     311              
- Misses      9453    9521      +68     

Files	Coverage Δ
src/views/text_input.rs	8.20% <0.00%> (ø)
src/id.rs	0.00% <0.00%> (ø)
src/context.rs	0.00% <0.00%> (ø)
src/window_handle.rs	0.00% <0.00%> (ø)
src/style.rs	15.90% <0.00%> (-1.29%)	⬇️

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