chore: core refact app

[emidev98]

This pull request move Keepers, AppModules and AppUpgrade handlers to their own files that way app.go is more legible

[codecov]

Codecov Report

Merging #204 (bf46e77) into release/v2.7 (8fb9783) will decrease coverage by 5.07%.
Report is 9 commits behind head on release/v2.7.
The diff coverage is 67.15%.

@@               Coverage Diff                @@
##           release/v2.7     #204      +/-   ##
================================================
- Coverage         70.43%   65.37%   -5.07%     
================================================
  Files                43       45       +2     
  Lines              2493     2134     -359     
================================================
- Hits               1756     1395     -361     
  Misses              583      583              
- Partials            154      156       +2     

Files	Coverage Δ
app/modules.go	100.00% <100.00%> (ø)
x/tokenfactory/bindings/wasm.go	100.00% <ø> (ø)
app/app.go	62.16% <87.30%> (-20.74%)	⬇️
app/export.go	0.00% <0.00%> (ø)
app/upgrade_handler.go	58.33% <58.33%> (ø)

... and 4 files with indirect coverage changes

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