Move default function code/environment to constants file

constants.py

@@ -0,0 +1,32 @@
+DEFAULT_FUNCTION_NAME = 'foo'
+
+DEFAULT_SCRIPT = """async (req) => {
+    console.log(`Method:${req.method}`)
+    console.log(`Generating ${environment.lines} random lines...`)
+    let svgContent = "";
+
+    for (let i = 0; i < environment.lines; i++) {
+        console.log(i)
+        let pathD = "M2 " + Math.random() * 79;
+        let circles = "";
+
+        for (let x = 12; x <= 202; x += 10) {
+            let y = Math.random() * 79
+            pathD += ` L${x} ${y}`;
+            circles += `<circle cx="${x}" cy="${y}" r="1"></circle>`;
+        }
+
+        let pathColor = `rgb(${Math.random() * 255}, ${Math.random() * 255}, ${Math.random() * 255})`;
+        svgContent += `
+            <g style="fill: ${pathColor}; stroke: ${pathColor};">
+                <path d="${pathD}" fill="none" stroke="${pathColor}"></path>
+                ${circles}
+            </g>`;
+    }
+
+    return HtmlResponse(`<svg viewBox="0 0 204 79" preserveAspectRatio="none">${svgContent}</svg>`);
+}"""
+
+DEFAULT_ENVIRONMENT = """{
+    "lines": 3
+}"""