chain/state: use tendermint-rs consensus::State serializers

[tony-iqlusion]

These were removed in v0.17.0-rc1, but added back in v0.17.0-rc3.

[codecov-io]

Codecov Report

Merging #232 (c5319ab) into develop (4a0063c) will decrease coverage by 0.06%.
The diff coverage is 12.50%.

@@             Coverage Diff             @@
##           develop     #232      +/-   ##
===========================================
- Coverage    25.65%   25.59%   -0.07%     
===========================================
  Files           79       78       -1     
  Lines         3145     3134      -11     
===========================================
- Hits           807      802       -5     
+ Misses        2338     2332       -6     

Impacted Files	Coverage Δ
src/chain/state.rs	42.73% <12.50%> (+0.36%)	⬆️

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