feat(launch): change param request

[aljo242]

Closes #930

@lubtd let me know what you think !

[codecov]

Codecov Report

Merging #957 (533361b) into develop (6f6ae7d) will decrease coverage by 0.10%.
The diff coverage is 4.92%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #957      +/-   ##
===========================================
- Coverage    10.66%   10.55%   -0.11%     
===========================================
  Files          272      275       +3     
  Lines        65229    66486    +1257     
===========================================
+ Hits          6954     7017      +63     
- Misses       58112    59300    +1188     
- Partials       163      169       +6     

Impacted Files	Coverage Δ
x/launch/keeper/grpc_param_change.go	0.00% <0.00%> (ø)
x/launch/keeper/request.go	95.43% <0.00%> (-4.57%)	⬇️
x/launch/simulation/simulation.go	0.00% <0.00%> (ø)
x/launch/simulation/store.go	58.46% <0.00%> (-6.50%)	⬇️
x/launch/types/genesis.pb.go	1.02% <0.00%> (-0.08%)	⬇️
x/launch/types/params.go	76.31% <ø> (ø)
x/launch/types/query.pb.gw.go	0.00% <0.00%> (ø)
x/participation/simulation/simulation.go	0.00% <ø> (ø)
x/launch/types/request.pb.go	2.56% <0.30%> (-0.67%)	⬇️
x/launch/types/events.pb.go	0.48% <0.37%> (-0.02%)	⬇️
... and 6 more

[lumtis]

We need to add logic in genesis.go for genesis export and import with ParamChange objects in the genesis state.

The easiest way to represent the genesis state would be to add LaunchID in ParamChange so information of type index is self-contained

message ParamChange {
  string module = 1;
  string param  = 2;
  bytes  value  = 3;
}

and adding in (m RequestContent) Validate(launchID uint64) verification of the launchID same as for GenesisAccount request

[aljo242]

Unit tests failing due to codecov upload

[lumtis]

👍

[lumtis]

We should add a query to list all param changes from a LaunchID

I think only the list query is sufficient, show query would not be necessary