feat(tests): add simapp setup helpers

[aleem1314]

Description

ref: #8961

Following up on #9697, this PR is the second step for #8961.

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[codecov]

Codecov Report

Merging #10020 (a066318) into master (ae9834e) will increase coverage by 0.11%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master   #10020      +/-   ##
==========================================
+ Coverage   63.63%   63.74%   +0.11%     
==========================================
  Files         573      573              
  Lines       53610    53655      +45     
==========================================
+ Hits        34114    34203      +89     
+ Misses      17549    17505      -44     
  Partials     1947     1947              

Impacted Files	Coverage Δ
simapp/test_helpers.go	26.72% <80.00%> (+26.03%)	⬆️
simapp/app.go	81.58% <0.00%> (+0.63%)	⬆️

[orijbot]

Visit https://dashboard.github.orijtech.com?back=0&pr=10020&remote=false&repo=cosmos%2Fcosmos-sdk to see benchmark details.

[colin-axner]

LGTM

[alexanderbez]

Note, you should be adding t.Helper() calls to any function that takes a *testing.T as an argument.