[#967] msg server impl usr ptr keepers (backport #971)

[mergify]

This is an automatic backport of pull request #971 done by Mergify.

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[codecov-commenter]

Codecov Report

Merging #996 (c8206b3) into v7.x (ac5f48b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             v7.x     #996   +/-   ##
=======================================
  Coverage   20.59%   20.59%           
=======================================
  Files         193      193           
  Lines       25231    25231           
=======================================
  Hits         5197     5197           
  Misses      19082    19082           
  Partials      952      952           

Impacted Files	Coverage Δ
x/gamm/handler.go	5.88% <ø> (ø)
x/gamm/keeper/msg_server.go	2.81% <ø> (ø)
x/incentives/handler.go	0.00% <ø> (ø)
x/incentives/keeper/msg_server.go	0.00% <ø> (ø)
x/superfluid/keeper/msg_server.go	0.00% <ø> (ø)
x/gamm/module.go	67.50% <100.00%> (ø)
x/incentives/module.go	54.54% <100.00%> (ø)

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