add template format for workload parsing flows

adapters-api/src/main/java/io/nosqlbench/engine/api/activityconfig/yaml/TemplateFormat.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2023 nosqlbench
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.nosqlbench.engine.api.activityconfig.yaml;
+
+import java.nio.file.Path;
+
+public enum TemplateFormat {
+    yaml("yaml","yml"),
+    json("json","json5"),
+    jsonnet("jsonnet","jsonnet5"),
+    inline();
+
+    private final String[] pathExtensions;
+
+    TemplateFormat(String... pathExtensions) {
+        this.pathExtensions = pathExtensions;
+    }
+
+    public static TemplateFormat valueOfPath(Path path) {
+        var fullName = path.toString();
+        String extension = fullName.substring(fullName.lastIndexOf('.')).toLowerCase();
+
+        for (TemplateFormat value : values()) {
+            for (String pathExtension : value.pathExtensions) {
+                if (pathExtension.equals(extension)) {
+                    return value;
+                }
+            }
+        }
+        throw new RuntimeException("Unable to determine source format for " + path);
+    }
+}