Add project configuration and test files in JSON5 format

- Introduced new configuration files for testing, including `default.project.json5`, `client_in_folder`, and others.
- Updated existing project files to use JSON5 format, ensuring consistency across configurations.
- Added new Lua scripts and model files to support various test cases.
- Adjusted snapshot files to align with the new project structure and properties.

.config/nextest.toml

@@ -0,0 +1,11 @@
+[profile.default]
+# Set a 10 second timeout for all tests
+slow-timeout = { period = "10s", terminate-after = 1 }
+
+# Fail fast on first test failure
+fail-fast = true
+
+[profile.ci]
+# CI profile with same timeout
+slow-timeout = { period = "10s", terminate-after = 1 }
+fail-fast = false