refactor(server/v2): kill viper from server components (backport #21663)

[mergify]

Description

@kocubinski rightfully pointed viper may not be needed as well in server components.
Follow-up of #21635

This gives us:

Main server, reads the app.toml and config.toml using viper, and pass down the whole config to server components as a map[string]any. The server components are able to unmarshal their own config from that map.

The app still needs viper, but this is unrelated to this PR.

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Summary by CodeRabbit

• New Features

  • Enhanced flexibility in configuration handling by transitioning from a specific library to a generic map structure across multiple server components.

• Bug Fixes

  • Improved initialization processes for various server components by refining the configuration data source.

• Chores

  • Removed direct dependency on the Viper library, streamlining the project's dependency management.

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This is an automatic backport of pull request #21663 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 88cfebe has failed:

On branch mergify/bp/release/v0.52.x/pr-21663
Your branch is up to date with 'origin/release/v0.52.x'.

You are currently cherry-picking commit 88cfebe15.
  (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/config.go
	modified:   server/v2/cometbft/go.mod
	modified:   server/v2/cometbft/server.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   server/v2/api/grpc/server.go
	deleted by us:   server/v2/api/grpcgateway/server.go
	deleted by us:   server/v2/commands.go
	deleted by us:   server/v2/config.go
	deleted by us:   server/v2/config_test.go
	deleted by us:   server/v2/server.go
	deleted by us:   server/v2/server_mock_test.go
	deleted by us:   server/v2/server_test.go
	deleted by us:   server/v2/store/server.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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