Initial support for capturing sink models

java/ql/test/utils/model-generator/CaptureSinkModels.expected

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+| p;Sinks;true;copyFileToDirectory;(Path,Path,CopyOption[]);;Argument[1];create-file; |

java/ql/test/utils/model-generator/CaptureSinkModels.qlref

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+utils/model-generator/CaptureSinkModels.ql

java/ql/test/utils/model-generator/p/Sinks.java

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+package p;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.nio.file.CopyOption;
+import java.nio.charset.Charset;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public class Sinks {
+    
+    public Path copyFileToDirectory(final Path sourceFile, final Path targetDirectory, final CopyOption... copyOptions) throws IOException {
+        return Files.copy(sourceFile, targetDirectory.resolve(sourceFile.getFileName()), copyOptions);
+    }
+
+    // TODO: not detected
+    public String readUrl(final URL url, Charset encoding) throws IOException {
+        try (InputStream in = url.openStream()) {
+            byte[] bytes = in.readAllBytes();
+            return new String(bytes, encoding);
+        }
+    }
+
+}