chore(crates): introduce new config crate for sprout configuration

crates/config/src/phases.rs

@@ -0,0 +1,30 @@
+use serde::{Deserialize, Serialize};
+use std::collections::BTreeMap;
+
+/// Configures the various phases of the boot process.
+/// This allows hooking various phases to run actions.
+#[derive(Serialize, Deserialize, Debug, Default, Clone)]
+pub struct PhasesConfiguration {
+    /// The early phase is run before drivers are loaded.
+    #[serde(default)]
+    pub early: Vec<PhaseConfiguration>,
+    /// The startup phase is run after drivers are loaded, but before entries are displayed.
+    #[serde(default)]
+    pub startup: Vec<PhaseConfiguration>,
+    /// The late phase is run after the entry is chosen, but before the actions are executed.
+    #[serde(default)]
+    pub late: Vec<PhaseConfiguration>,
+}
+
+/// Configures a single phase of the boot process.
+/// There can be multiple phase configurations that are
+/// executed sequentially.
+#[derive(Serialize, Deserialize, Debug, Default, Clone)]
+pub struct PhaseConfiguration {
+    /// The actions to run when the phase is executed.
+    #[serde(default)]
+    pub actions: Vec<String>,
+    /// The values to insert into the context when the phase is executed.
+    #[serde(default)]
+    pub values: BTreeMap<String, String>,
+}