client: Implement Eq for Connection

[ids1024]

This is useful in some cases, and there's no harm to providing it.

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (8581b9d) 73.02% compared to head (e22b41d) 72.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #669      +/-   ##
==========================================
- Coverage   73.02%   72.98%   -0.05%     
==========================================
  Files          47       47              
  Lines        7779     7785       +6     
==========================================
+ Hits         5681     5682       +1     
- Misses       2098     2103       +5     

Flag	Coverage Δ
main	58.29% <0.00%> (-0.05%)	⬇️
test--	78.03% <0.00%> (?)
test--server_system	61.32% <0.00%> (-0.03%)	⬇️
test-client_system-	69.03% <0.00%> (-0.07%)	⬇️
test-client_system-server_system	51.38% <0.00%> (-0.05%)	⬇️

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Files	Coverage Δ
wayland-backend/src/client_api.rs	86.36% <ø> (ø)
wayland-client/src/conn.rs	83.87% <ø> (ø)
wayland-backend/src/rs/client_impl/mod.rs	77.63% <0.00%> (-0.25%)	⬇️
wayland-backend/src/sys/client_impl/mod.rs	71.03% <0.00%> (-0.30%)	⬇️

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