feat: Implement flight search functionality

This commit introduces the ability to search for flights based on user-defined criteria.

Key changes:
- Added `GetFlightsSearchContentUseCase` interface in the domain layer and its implementation `GetFlightsSearchContentUseCaseImpl` in the repository layer to handle flight search logic.
- Implemented `FlightDomainMapper` to map `FlightResponse` from the API to the domain `Flight` model.
- Updated `NetworkModule`:
    - Introduced `ServicesAPI` and `NativeAppsAPI` qualifiers to differentiate between Retrofit instances for different Ryanair APIs.
    - Configured a new Retrofit instance for the `nativeapps.ryanair.com` base URL.
    - Modified `FlightService` to use the `nativeapps.ryanair.com` base URL.
- Updated `FlightService` endpoint to `api/v4/en-gb/Availability`.
- Integrated `GetFlightsSearchContentUseCase` into `HomeScreenViewModel` to trigger flight searches.
- Created `SearchOptions` data class in the domain layer to encapsulate search parameters.
- Added `GetFlightsSearchContentUseCaseModule` to provide the use case implementation via Hilt.

domain/search/src/main/kotlin/dev/adriankuta/flights/domain/search/GetFlightsSearchContentUseCase.kt

@@ -0,0 +1,8 @@
+package dev.adriankuta.flights.domain.search
+
+import dev.adriankuta.flights.domain.search.entities.SearchOptions
+import dev.adriankuta.flights.domain.types.Flight
+
+fun interface GetFlightsSearchContentUseCase {
+    suspend operator fun invoke(searchOptions: SearchOptions): Flight
+}

domain/search/src/main/kotlin/dev/adriankuta/flights/domain/search/entities/SearchOptions.kt

@@ -0,0 +1,13 @@
+package dev.adriankuta.flights.domain.search.entities
+
+import dev.adriankuta.flights.domain.types.Airport
+import java.time.LocalDate
+
+data class SearchOptions(
+    val origin: Airport.Departure,
+    val destination: Airport.Arrival,
+    val date: LocalDate,
+    val adults: Int,
+    val teens: Int,
+    val children: Int,
+)