Create GetUrlResolver interface

Implementations should just perform a GET request and return the raw body as bytes

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/GetUrlResolver.kt

@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2026 Element Creations Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.matrix.api
+
+fun interface GetUrlResolver {
+    /**
+     * Execute generic GET requests through the SDKs internal HTTP client.
+     */
+    suspend fun getUrl(url: String): Result<ByteArray>
+}