refactor(campaign): remove msg add shares

[aljo242]

Closes #819

[codecov]

Codecov Report

Merging #837 (601298c) into develop (832b702) will decrease coverage by 0.02%.
The diff coverage is 55.40%.

@@             Coverage Diff             @@
##           develop     #837      +/-   ##
===========================================
- Coverage    10.54%   10.52%   -0.03%     
===========================================
  Files          332      330       -2     
  Lines        77755    77249     -506     
===========================================
- Hits          8199     8129      -70     
+ Misses       69348    68915     -433     
+ Partials       208      205       -3     

Impacted Files	Coverage Δ
pkg/types/consensus_state.go	100.00% <ø> (ø)
pkg/types/validator_set.go	92.30% <ø> (ø)
x/campaign/simulation/simulation.go	0.00% <ø> (ø)
x/campaign/types/tx.pb.go	0.57% <0.00%> (+<0.01%)	⬆️
x/monitoringc/keeper/monitoring_packet.go	100.00% <ø> (ø)
x/monitoringc/keeper/msg_create_client.go	95.38% <ø> (ø)
x/monitoringc/module_ibc.go	0.00% <0.00%> (ø)
x/monitoringc/types/genesis.go	100.00% <ø> (ø)
x/monitoringp/keeper/begin_block.go	95.38% <ø> (ø)
x/monitoringp/keeper/consumer_client.go	71.42% <ø> (ø)
... and 7 more

[lumtis]

LGTM