feat(accounts): Add header.Service support

[testinginprod]

Description

This PR adds header service support to x/accounts implementer, an account might need header info (eg: for signing),
this is a way to get access to that data.

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[coderabbitai]

Walkthrough

The overall change integrates a new HeaderService into a blockchain application using the Cosmos SDK. This service is used to retrieve header information, and it affects various parts of the application, including initialization routines and account handling. The HeaderService is now a dependency in several components, leading to updates in function signatures, method calls, and struct definitions. Additionally, a private function openKVStore replaces a previously public one, affecting schema building and data access.

Changes

Files	Change Summary
runtime/header.go	Introduced HeaderService with GetHeaderInfo function in the runtime package.
simapp/app.go x/accounts/keeper.go	Added runtime.HeaderService{} and adjusted initialization and struct definitions to include HeaderService.
x/accounts/internal/implementation/... (context.go, implementation.go) x/accounts/internal/implementation/... (context_test.go, implementation_test.go)	Imported "header" package, modified function parameters, renamed OpenKVStore to openKVStore, and updated method calls and struct initializations to include HeaderService.
x/accounts/utils_test.go	Removed an argument from the NewKeeper function call.

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[github-actions]

@testinginprod your pull request is missing a changelog!

[facundomedica]

ACK