feat: load fbridge & fswap store (backport #365)

[mergify]

Description

This patch adds setupUpgradeStoreLoaders(), which handles store upgrades.

How has this been tested?

1. Start v3-Rose chain.
2. Upgrade the chain to v4-Marigold.
3. Access the new module's state.
   • e.g. fnsad q fswap swaps

• Expected results:
  • Without the patch: panics
  • With the patch: returns an empty array of swaps.

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.

---

This is an automatic backport of pull request #365 done by [Mergify](https://mergify.com).

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 14 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (release/v4.0.x@98239cb). Click here to learn what that means.

Additional details and impacted files

@@                Coverage Diff                @@
##             release/v4.0.x     #367   +/-   ##
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  Coverage                  ?   50.17%           
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  Files                     ?       10           
  Lines                     ?     1425           
  Branches                  ?        0           
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  Hits                      ?      715           
  Misses                    ?      663           
  Partials                  ?       47           

Files	Coverage Δ
app/app.go	82.38% <33.33%> (ø)