feat: make logs sharing API public

[evsaev]

This PR enables developers to export Pulse logs through a low-level API. Specifically, it changes the access level of ShareItems and ShareService from package -> public.

Context

I’m using Pulse in my app and want to allow end users to export device logs by tapping a button on the troubleshooting screen. To make this process as seamless as possible - and to avoid the overhead of integrating PulseUI views for export - I’d prefer a lightweight, low-level way to access the logs.

Usage

let store = LoggerStore.shared
let context = store.backgroundContext

let entitiesToExport = try await context.perform {
    let fetchRequest = NSFetchRequest<LoggerSessionEntity>(entityName: "LoggerSessionEntity")
    fetchRequest.predicate = ... // required filters go here
    fetchRequest.sortDescriptors  = ... // required sorting goes there
    return try context.fetch(fetchRequest)
}

let logs = try await ShareService.share(
  entitiesToExport,
  store: store,
  as: .html
)

if let logsFileURL = logs.items.first as? URL else {
  // show share sheet for logs file
}

[evsaev]

This doesn’t have to be part of the PR, but I noticed it’s unused -> can safely be removed