feat: Add Redis client module and tests

- Add a new Redis client module to the SAL library.
- Implement Rhai wrappers for Redis connection and operations.
- Add comprehensive test suite for the Redis client module.
- Update documentation to include Redis client module details.
- Add .gitignore entries to exclude test logs and files.

.gitignore

@@ -20,4 +20,5 @@ Cargo.lock
 
 /target
 /rhai_test_download
-/rhai_test_fs
+/rhai_test_fs
+run_rhai_tests.log