M1: core engine, config, plugin model and core plugins

- Cargo workspace (core, plugins, tui, cli) with drop-in compatible CLI
- Python-compatible config file handling, limits, views, rates, MMM, history
- process collection via sysinfo + procfs, filters, thresholds, events, actions
- 20 core plugins (cpu, percpu, mem, memswap, load, fs, network, diskio, ...)
- stdout, stdout-csv, stdout-json, --issue, --modules-list output modes
- differential test harness against the Python implementation

crates/glances-plugins/src/plugins/psutilversion.rs

@@ -0,0 +1,47 @@
+//! Psutil version plugin.
+//!
+//! The Rust rewrite does not use psutil; the plugin is kept for drop-in
+//! compatibility of the stats schema and reports "N/A".
+
+use crate::fields;
+use glances_core::plugin::{Plugin, PluginModel, UpdateContext};
+use glances_core::{Args, Config};
+use serde_json::{Value, json};
+
+pub struct PsutilVersionPlugin {
+    pub model: PluginModel,
+}
+
+impl PsutilVersionPlugin {
+    pub fn new(config: &Config, args: &Args) -> Self {
+        let model = PluginModel::new(
+            "psutilversion",
+            fields! {},
+            Vec::new(),
+            Value::Null,
+            config,
+            args.time.unwrap_or(2.0),
+            args.disable_history,
+            args.disable_config_exec,
+        );
+        Self { model }
+    }
+}
+
+impl Plugin for PsutilVersionPlugin {
+    fn name(&self) -> &str {
+        "psutilversion"
+    }
+
+    fn model(&self) -> &PluginModel {
+        &self.model
+    }
+
+    fn model_mut(&mut self) -> &mut PluginModel {
+        &mut self.model
+    }
+
+    fn collect(&mut self, _ctx: &mut UpdateContext) -> anyhow::Result<Value> {
+        Ok(json!("N/A"))
+    }
+}