wayland.shm: Add support for wl_shm version 2

[PolyMeilex]

Version 2 adds release request, we don't have to do anything with it in Smithay as it is marked as destructor.

Draft until next wayland-rs release

[ids1024]

Nice, I forgot this was added to wayland. Now if only https://gitlab.freedesktop.org/wayland/wayland/-/merge_requests/388 could be merged too...

[ids1024]

The new wayland-rs release should have this.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 19.66%. Comparing base (d5cedee) to head (25416ed).
Report is 16 commits behind head on master.

Files with missing lines	Patch %	Lines
src/wayland/shm/handlers.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1532   +/-   ##
=======================================
  Coverage   19.66%   19.66%           
=======================================
  Files         169      169           
  Lines       27749    27810   +61     
=======================================
+ Hits         5456     5468   +12     
- Misses      22293    22342   +49     

Flag	Coverage Δ
wlcs-buffer	17.08% <50.00%> (+<0.01%)	⬆️
wlcs-core	16.82% <50.00%> (+<0.01%)	⬆️
wlcs-output	6.89% <50.00%> (-0.02%)	⬇️
wlcs-pointer-input	18.60% <50.00%> (-0.01%)	⬇️

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