refactor(launch): merge request related messages into MsgSendRequest

[lumtis]

All requests merged into a single MsgSendRequest message
Same functionality, 3700 lines removed

To test: use the spnd CLI, interface remains the same

[codecov]

Codecov Report

Merging #947 (a9203b2) into develop (c65411c) will decrease coverage by 0.07%.
The diff coverage is 58.90%.

@@             Coverage Diff             @@
##           develop     #947      +/-   ##
===========================================
- Coverage    10.75%   10.67%   -0.08%     
===========================================
  Files          280      272       -8     
  Lines        67161    64942    -2219     
===========================================
- Hits          7220     6931     -289     
+ Misses       59780    57849    -1931     
- Partials       161      162       +1     

Impacted Files	Coverage Δ
x/launch/simulation/simulation.go	0.00% <0.00%> (ø)
x/launch/types/tx.pb.go	0.53% <ø> (+0.04%)	⬆️
x/launch/types/msg_send_request.go	30.76% <30.76%> (ø)
x/launch/keeper/msg_send_request.go	100.00% <100.00%> (ø)
x/launch/keeper/request.go	100.00% <100.00%> (ø)
x/launch/types/request_content.go	100.00% <100.00%> (ø)
x/campaign/simulation/store.go	82.43% <0.00%> (-2.03%)	⬇️

[aljo242]

Amazing !!