refactor(server/v2): clean up storage use and config (backport #22008)

[mergify]

Description

Related to: #21678

This PR cleans up the dependency story for storage. After the merge of #21989 we no longer need to further bloat the AppI interface with GetStore() any, which is the core change in this PR.

--- a/server/v2/types.go
+++ b/server/v2/types.go
type AppI[T transaction.Tx] interface {
        InterfaceRegistry() server.InterfaceRegistry
        GetAppManager() *appmanager.AppManager[T]
        GetGPRCMethodsToMessageMap() map[string]func() gogoproto.Message
-       GetStore() any
 }

The store/v2.RootStore interface was also broken up slightly so that the dependency lines are cleaner for clients in server/v2.

Configuration specification was pushed down from server/v2/store into store/v2 directly. The StoreBuilder was also moved there to prevent a dependency from forming (in either direction) runtime/v2 <-> server/v2.

---

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Summary by CodeRabbit

Summary by CodeRabbit

• New Features

  • Enhanced state management through the integration of a new store backend.
  • Improved command initialization process with updated parameters for better store handling.
  • Integration of store parameter in testnet command structure for better state management.
  • Introduction of a singleton pattern for a scoped store builder to streamline store management.

• Bug Fixes

  • Minor grammatical corrections in comments for clarity.

• Documentation

  • Updated comments to reflect changes in method signatures and functionality.

• Refactor

  • Streamlined server and store structures by removing obsolete parameters and methods.
  • Unified snapshot management logic for improved flexibility.
  • Enhanced configuration handling for better modularity and maintainability.

---

This is an automatic backport of pull request #22008 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 05fb492 has failed:

On branch mergify/bp/release/v0.52.x/pr-22008
Your branch is up to date with 'origin/release/v0.52.x'.

You are currently cherry-picking commit 05fb492bd.
  (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:   server/v2/cometbft/server.go
	modified:   server/v2/cometbft/types/store.go
	modified:   simapp/v2/app_di.go
	modified:   simapp/v2/app_test.go
	modified:   simapp/v2/simdv2/cmd/commands.go
	modified:   simapp/v2/simdv2/cmd/root_di.go
	modified:   simapp/v2/simdv2/cmd/testnet.go
	new file:   store/v2/root/builder.go
	new file:   store/v2/root/config.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   runtime/v2/app.go
	deleted by us:   runtime/v2/builder.go
	deleted by us:   runtime/v2/module.go
	deleted by us:   runtime/v2/store.go
	deleted by us:   server/v2/commands.go
	deleted by us:   server/v2/config_test.go
	deleted by us:   server/v2/server.go
	deleted by us:   server/v2/server_test.go
	deleted by us:   server/v2/store/server.go
	deleted by us:   server/v2/store/snapshot.go
	deleted by us:   server/v2/types.go
	deleted by us:   store/v2/root/factory.go
	deleted by us:   store/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

[julienrbrt]

Just need to be a partial backport. I'll do that in a bit