feat(campaign): emit events

[aljo242]

Closes #428

What does this PR does?

Matthews3301 please review :)

[codecov]

Codecov Report

Merging #750 (1780840) into develop (ff51a17) will decrease coverage by 0.23%.
The diff coverage is 5.00%.

@@             Coverage Diff             @@
##           develop     #750      +/-   ##
===========================================
- Coverage    11.27%   11.04%   -0.24%     
===========================================
  Files          281      282       +1     
  Lines        64146    66452    +2306     
===========================================
+ Hits          7233     7338     +105     
- Misses       56742    58940    +2198     
- Partials       171      174       +3     

Impacted Files	Coverage Δ
x/campaign/types/events.pb.go	0.54% <0.54%> (ø)
x/campaign/keeper/msg_add_shares.go	77.77% <53.57%> (-15.84%)	⬇️
x/campaign/keeper/msg_unredeem_vouchers.go	63.15% <53.84%> (-3.51%)	⬇️
x/campaign/keeper/msg_add_vesting_options.go	82.14% <100.00%> (+7.14%)	⬆️
x/campaign/keeper/msg_burn_vouchers.go	72.72% <100.00%> (+4.87%)	⬆️
x/campaign/keeper/msg_create_campaign.go	84.21% <100.00%> (+2.39%)	⬆️
x/campaign/keeper/msg_edit_campaign.go	100.00% <100.00%> (ø)
x/campaign/keeper/msg_initialize_mainnet.go	94.23% <100.00%> (+0.75%)	⬆️
x/campaign/keeper/msg_mint_vouchers.go	73.33% <100.00%> (+4.91%)	⬆️
x/campaign/keeper/msg_redeem_vouchers.go	89.65% <100.00%> (+3.29%)	⬆️
... and 3 more