android: add core common module logging crashlytics and feature flags

android/core/common/build.gradle.kts

@@ -0,0 +1,7 @@
+plugins {
+    id("org.jetbrains.kotlin.jvm")
+}
+
+kotlin {
+    jvmToolchain(17)
+}

android/core/common/src/main/kotlin/ru/daemonlord/messenger/core/feature/FeatureFlags.kt

@@ -0,0 +1,7 @@
+package ru.daemonlord.messenger.core.feature
+
+data class FeatureFlags(
+    val accountManagementEnabled: Boolean,
+    val twoFactorEnabled: Boolean,
+    val mediaGalleryEnabled: Boolean,
+)

android/core/common/src/main/kotlin/ru/daemonlord/messenger/core/logging/AppLogger.kt

@@ -0,0 +1,8 @@
+package ru.daemonlord.messenger.core.logging
+
+interface AppLogger {
+    fun d(tag: String, message: String)
+    fun i(tag: String, message: String)
+    fun w(tag: String, message: String, throwable: Throwable? = null)
+    fun e(tag: String, message: String, throwable: Throwable? = null)
+}

android/core/common/src/main/kotlin/ru/daemonlord/messenger/domain/common/AppError.kt

@@ -0,0 +1,9 @@
+package ru.daemonlord.messenger.domain.common
+
+sealed interface AppError {
+    data object InvalidCredentials : AppError
+    data object Unauthorized : AppError
+    data object Network : AppError
+    data class Server(val message: String?) : AppError
+    data class Unknown(val cause: Throwable?) : AppError
+}

android/core/common/src/main/kotlin/ru/daemonlord/messenger/domain/common/AppResult.kt

@@ -0,0 +1,6 @@
+package ru.daemonlord.messenger.domain.common
+
+sealed interface AppResult<out T> {
+    data class Success<T>(val data: T) : AppResult<T>
+    data class Error(val reason: AppError) : AppResult<Nothing>
+}