feat(harmony): enhance PhysicalHost with builder methods and update dependencies

- Added builder methods to `PhysicalHost` for configuring CPU, memory size, storage, MAC address, labels, and management interface.
- Updated the edition of various Cargo.toml files to 2024.
- Implemented workspace inheritance for version, readme, and license fields in Cargo.toml files.

harmony-rs/examples/opnsense/README.md

@@ -0,0 +1,15 @@
+## OPNSense demo
+
+Download the virtualbox snapshot from {{TODO URL}}
+
+Start the virtualbox image
+
+This virtualbox image is configured to use a bridge on the host's physical interface, make sure the bridge is up and the virtual machine can reach internet.
+
+Credentials are opnsense default (root/opnsense)
+
+Run the project with the correct ip address on the command line :
+
+```bash
+cargo run -p example-opnsense -- 192.168.5.229
+```