docs: Add documentation for running Rhai tests

- Added a comprehensive guide on running Rhai tests within the
  SAL library.  This includes instructions for running all tests,
  tests for specific modules, and individual tests.
- Created a shell script (`run_rhai_tests.sh`) to simplify running
  all Rhai tests and provide a summary of results.  This improves
  the testing workflow and makes it easier to identify failures.

run_rhai_tests.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+# run_rhai_tests.sh
+# Script to run all Rhai tests in the rhai_tests directory
+
+# Set colors for output
+GREEN='\033[0;32m'
+RED='\033[0;31m'
+YELLOW='\033[0;33m'
+BLUE='\033[0;34m'
+NC='\033[0m' # No Color
+
+# Print header
+echo -e "${BLUE}=======================================${NC}"
+echo -e "${BLUE}      Running All Rhai Tests          ${NC}"
+echo -e "${BLUE}=======================================${NC}"
+
+# Find all test runner scripts
+RUNNERS=$(find src/rhai_tests -name "run_all_tests.rhai")
+
+# Initialize counters
+TOTAL_MODULES=0
+PASSED_MODULES=0
+FAILED_MODULES=0
+
+# Run each test runner
+for runner in $RUNNERS; do
+    # Extract module name from path
+    module=$(echo $runner | cut -d'/' -f3)
+    
+    echo -e "\n${YELLOW}Running tests for module: ${module}${NC}"
+    echo -e "${YELLOW}-------------------------------------${NC}"
+    
+    # Run the test runner
+    herodo --path $runner
+    
+    # Check if the test passed
+    if [ $? -eq 0 ]; then
+        echo -e "${GREEN}✓ Module ${module} tests passed${NC}"
+        PASSED_MODULES=$((PASSED_MODULES + 1))
+    else
+        echo -e "${RED}✗ Module ${module} tests failed${NC}"
+        FAILED_MODULES=$((FAILED_MODULES + 1))
+    fi
+    
+    TOTAL_MODULES=$((TOTAL_MODULES + 1))
+done
+
+# Print summary
+echo -e "\n${BLUE}=======================================${NC}"
+echo -e "${BLUE}            Test Summary              ${NC}"
+echo -e "${BLUE}=======================================${NC}"
+echo -e "Total modules tested: ${TOTAL_MODULES}"
+echo -e "Passed: ${GREEN}${PASSED_MODULES}${NC}"
+echo -e "Failed: ${RED}${FAILED_MODULES}${NC}"
+
+# Set exit code based on test results
+if [ $FAILED_MODULES -eq 0 ]; then
+    echo -e "\n${GREEN}All tests passed!${NC}"
+    exit 0
+else
+    echo -e "\n${RED}Some tests failed!${NC}"
+    exit 1
+fi