chore: add BinaryDependenciesDownloader

Sources/BinaryDependencyManager/Utils/BinaryDependenciesDownloader.swift

@@ -0,0 +1,32 @@
+/// A protocol for downloading binary dependencies from git repositories.
+protocol BinaryDependenciesDownloader {
+    /// Downloads the source code as a zip archive from the specified repo and release tag.
+    ///
+    /// - Parameters:
+    ///   - repo: Git repository, e.g. "owner/repo".
+    ///   - tag: The release tag to download.
+    ///   - outputFilePath: The output file path for the downloaded archive.
+    /// - Throws: If the download fails.
+    func downloadSourceCode(
+        repo: String,
+        tag: String,
+        outputFilePath: String
+    ) throws
+
+    /// Downloads a specific release asset from git repo matching the provided pattern.
+    ///
+    /// - Parameters:
+    ///   - repo: Git repository, e.g. "owner/repo".
+    ///   - tag: The release tag to download.
+    ///   - pattern: Optional asset name pattern to select the correct file.
+    ///   - outputFilePath: Where to save the downloaded asset.
+    /// - Throws: If the download fails.
+    func downloadReleaseAsset(
+        repo: String,
+        tag: String,
+        pattern: String?,
+        outputFilePath: String
+    ) throws
+}
+
+extension CLI.GitHub: BinaryDependenciesDownloader {}