Add kaiming initialization

[YichengDWu]

Directly taken form Flux

[codecov]

Codecov Report

Base: 81.38% // Head: 89.08% // Increases project coverage by +7.70% 🎉

Coverage data is based on head (b705816) compared to base (4e394f7).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #138      +/-   ##
==========================================
+ Coverage   81.38%   89.08%   +7.70%     
==========================================
  Files          15       19       +4     
  Lines        1101     1310     +209     
==========================================
+ Hits          896     1167     +271     
+ Misses        205      143      -62     

Impacted Files	Coverage Δ
src/autodiff.jl	57.14% <100.00%> (-10.55%)	⬇️
src/utils.jl	93.24% <100.00%> (+0.93%)	⬆️
src/deprecated.jl	80.00% <0.00%> (-20.00%)	⬇️
src/nnlib.jl	78.94% <0.00%> (-3.00%)	⬇️
src/layers/conv.jl	97.71% <0.00%> (-2.29%)	⬇️
src/Lux.jl	100.00% <0.00%> (ø)
src/core.jl	100.00% <0.00%> (ø)
src/transform.jl	0.00% <0.00%> (ø)
src/layers/dropout.jl	100.00% <0.00%> (ø)
... and 9 more

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[avik-pal]

Needs tests.