Removed hardcoded navigator

[AndroidPoet]

🎯 Goal

Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. If it fixes a bug or resolves a feature request, be sure to link to that issue.

The goal of this pull request is to restructure the code by moving the Compose Navigator to a ViewModel. This change is being made to make Composables independent of concrete dependencies, thereby improving scalability. This pull request addresses the need for a more modular and maintainable architecture in the codebase.

🛠 Implementation details

Describe the implementation details for this Pull Request.

In this pull request, the implementation details involve reorganizing the code to separate the Compose Navigator from concrete dependencies and placing it within a ViewModel. This change allows for greater flexibility and independence of Composables. It involves moving relevant functions, dependencies, and logic into the ViewModel. The Composables can now interact with the ViewModel instead of concrete dependencies.

✍️ Explain examples

Explain examples with code for this updates.

@HiltViewModel
class WhatsAppMessagesViewModel @Inject constructor(
  private val chatClient: ChatClient,
  private val composeNavigator: AppComposeNavigator,
  savedStateHandle: SavedStateHandle
) : ViewModel() {
  private val messageMutableUiState =
    MutableStateFlow<WhatsAppMessageUiState>(WhatsAppMessageUiState.Loading)
  val messageUiSate: StateFlow<WhatsAppMessageUiState> = messageMutableUiState

  private val channelId = savedStateHandle.get<String>("channelId")

  init {
    if (channelId != null) {
      fetchChannel(channelId = channelId)
    }
  }

  fun handleEvents(whatsAppMessageEvent: WhatsAppMessageEvent) {
    when (whatsAppMessageEvent) {
      is WhatsAppMessageEvent.NavigateUp -> composeNavigator.navigateUp()
    }
  }

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[AndroidPoet]

Hi @skydoves
I've made a small contribution to this project . Would you please review when you have sometime?

Thanks,
Ranbir Singh

[skydoves]

Looks good to me. Thanks for your contribution!