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

crates/config/src/generators.rs

@@ -0,0 +1,40 @@
+use crate::generators::bls::BlsConfiguration;
+use crate::generators::list::ListConfiguration;
+use crate::generators::matrix::MatrixConfiguration;
+use serde::{Deserialize, Serialize};
+
+/// Configuration for the BLS generator.
+pub mod bls;
+
+/// Configuration for the list generator.
+pub mod list;
+
+/// Configuration for the matrix generator.
+pub mod matrix;
+
+/// Declares a generator configuration.
+/// Generators allow generating entries at runtime based on a set of data.
+#[derive(Serialize, Deserialize, Debug, Default, Clone)]
+pub struct GeneratorDeclaration {
+    /// Matrix generator configuration.
+    /// Matrix allows you to specify multiple value-key values as arrays.
+    /// This allows multiplying the number of entries by any number of possible
+    /// configuration options. For example,
+    /// data.x = ["a", "b"]
+    /// data.y = ["c", "d"]
+    /// would generate an entry for each of these combinations:
+    /// x = a, y = c
+    /// x = a, y = d
+    /// x = b, y = c
+    /// x = b, y = d
+    #[serde(default)]
+    pub matrix: Option<MatrixConfiguration>,
+    /// BLS generator configuration.
+    /// BLS allows you to pass a filesystem path that contains a set of BLS entries.
+    /// It will generate a sprout entry for every supported BLS entry.
+    #[serde(default)]
+    pub bls: Option<BlsConfiguration>,
+    /// List generator configuration.
+    /// Allows you to specify a list of values to generate an entry from.
+    pub list: Option<ListConfiguration>,
+}