Update slashing hooks

[ValarDragon]

Updates slashing hooks as the superlfuid design has changed. The adding of slashFraction and effectiveSlashFraction is a bit silly. We should get the distribution module to compute effectiveSlashFraction itself later, but leaving that as a TODO for now.

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[codecov-commenter]

Codecov Report

Merging #116 (689410c) into v0.45.0x-osmo-v7 (f432981) will increase coverage by 0.01%.
The diff coverage is 50.00%.

@@                 Coverage Diff                  @@
##           v0.45.0x-osmo-v7     #116      +/-   ##
====================================================
+ Coverage             61.02%   61.03%   +0.01%     
====================================================
  Files                   588      588              
  Lines                 37840    37823      -17     
====================================================
- Hits                  23091    23087       -4     
+ Misses                12785    12774      -11     
+ Partials               1964     1962       -2     

Impacted Files	Coverage Δ
x/slashing/keeper/hooks.go	82.14% <ø> (+4.72%)	⬆️
x/staking/keeper/hooks.go	30.00% <0.00%> (-0.77%)	⬇️
x/staking/types/hooks.go	9.09% <0.00%> (+2.42%)	⬆️
x/distribution/keeper/hooks.go	25.00% <100.00%> (+1.31%)	⬆️
x/staking/keeper/slash.go	68.65% <100.00%> (-0.47%)	⬇️
crypto/keys/internal/ecdsa/privkey.go	83.78% <0.00%> (+2.70%)	⬆️