feat(runtime/v2): store loader on simappv2 (backport #21704)

[mergify]

Description

Closes: #21637

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Summary by CodeRabbit

Summary by CodeRabbit

• New Features

  • Introduced a flexible store loading mechanism, allowing for custom loading strategies.
  • Enhanced store upgrade capabilities for better version management.
  • Added a feature to simulate nested messages in the base application.
  • Added documentation clarifying the location of the StoreLoader helper function.

• Bug Fixes

  • Improved the upgrade handling process to streamline store upgrades.

• Documentation

  • Updated testing capabilities by adding new dependencies for enhanced functionality.

• Refactor

  • Cleaned up code related to store loader configurations for clarity and relevance.

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This is an automatic backport of pull request #21704 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 7d6ff0d has failed:

On branch mergify/bp/release/v0.52.x/pr-21704
Your branch is up to date with 'origin/release/v0.52.x'.

You are currently cherry-picking commit 7d6ff0df5.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   runtime/store.go
	modified:   simapp/v2/upgrades.go
	modified:   x/upgrade/README.md
	modified:   x/upgrade/types/storeloader.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   CHANGELOG.md
	deleted by us:   runtime/v2/app.go
	deleted by us:   runtime/v2/module.go
	deleted by us:   runtime/v2/store.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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