chore: modify simapp to fulfill the sdk runtime.AppI interface

[phamminh0811]

Description

closes: #3152
Modify simapp to fulfill the sdk runtime.AppI interface

Commit Message / Changelog Entry

chore: modify simapp to fulfill the sdk runtime.AppI interface

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[colin-axner]

Thanks @phamminh0811 :) The changes look good to me

[damiannolan]

Thank you 🙏

[codecov-commenter]

Codecov Report

Merging #3216 (f808a46) into main (62e09ed) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3216   +/-   ##
=======================================
  Coverage   78.54%   78.54%           
=======================================
  Files         181      181           
  Lines       12580    12580           
=======================================
  Hits         9881     9881           
  Misses       2262     2262           
  Partials      437      437           

Impacted Files	Coverage Δ
modules/core/02-client/migrations/v7/store.go	68.85% <100.00%> (ø)
modules/core/02-client/simulation/decoder.go	100.00% <100.00%> (ø)
...dules/light-clients/06-solomachine/client_state.go	88.28% <100.00%> (ø)