Refactor: Migrate from Retrofit to Ktor

This commit migrates the network layer from Retrofit to Ktor.

Specific changes include:

- Replaced Retrofit
 with Ktor for network requests.
- Updated dependencies to include Ktor libraries.
- Refactored network service and data classes to use Ktor's API.
- Removed Retrofit-specific code and dependencies.
- Adjusted network module to provide Ktor client and services.
- Updated PixabayImageRepository
 to use the new Ktor-based PixabayService.

data/build.gradle.kts

@@ -23,16 +23,19 @@ android {
 }
 
 dependencies {
-    implementation(libs.retrofit)
-
-    implementation(platform(libs.okhttp.bom))
-    implementation(libs.okhttp)
-    implementation(libs.logging.interceptor)
-
     implementation(libs.androidx.paging.compose)
 
     implementation(libs.kotlinx.serialization.json)
-    implementation(libs.retrofit2.kotlinx.serialization.converter)
+
+    //Ktor
+    implementation(libs.ktor.client.android)
+    implementation(libs.ktor.client.resources)
+    implementation(libs.ktor.client.content.negotiation)
+    implementation(libs.ktor.client.logging)
+    implementation(libs.ktor.serialization.kotlinx.json)
+
+    //Logging
+    implementation(libs.slf4j.android)
 
     implementation(libs.androidx.room.runtime)
     ksp(libs.androidx.room.compiler)