feat(tera_factory): Implement hot reload example for Tera templates with Rhai

This commit adds a comprehensive hot reload example that demonstrates how to use the rhai_system for dynamic template rendering with Tera. Key improvements include:

- Refactor the example to use external script files instead of hardcoded Rhai code
- Implement proper module imports using the BasePathModuleResolver approach
- Fix template rendering by using keyword arguments in Tera function calls
- Add support for hot reloading both main and utility scripts
- Remove unnecessary output file generation to keep the example clean
- Fix compatibility issues with Rhai functions (avoiding to_string with parameters)

This example showcases how changes to Rhai scripts are automatically detected and applied to rendered templates without restarting the application, providing a smooth development experience.

tera_factory/examples/hot_reload/scripts/initial_utils.rhai

@@ -0,0 +1,22 @@
+// Utility functions for Tera templates - INITIAL VERSION
+
+// Format a date string
+fn format_date(date_str) {
+    let parts = date_str.split("-");
+    let year = parts[0];
+    let month = parts[1];
+    let day = parts[2];
+    
+    return `${month}/${day}/${year}`;
+}
+
+// Calculate a price with discount
+fn calculate_price(price, discount_percent) {
+    let discount = price * (discount_percent / 100.0);
+    return price - discount;
+}
+
+// Format a currency value
+fn format_currency(amount) {
+    return "$" + amount;
+}