This commit adds support for interacting with nodes via the CLI in the
Nexus simulation framework. This enables writing higher-level
integration tests that verify stack behavior and state through
standard CLI commands.
Key changes:
- Integrated `Cli::Interpreter` into the `Nexus::Node` class.
- Added `Node::InputCli()` to allow sending commands to a node with
`printf`-style formatting.
- Implemented output capturing logic in `Node::HandleCliOutput()` to
buffer and parse CLI responses into individual lines, stored in a
`CliOutputArray`.
- Added helper methods to `CliOutputLine` for matching and validating
the captured output.
- Added a new `cli_basic` Nexus test to demonstrate and validate the
CLI interaction functionality.
Abtin Keshavarzian