feat(config): allow printing default and computed config (#2521)

* feat: allow printing default and computed config

* fix custom modules

* actually fix custom modules

src/configs/battery.rs

@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct BatteryConfig<'a> {
     pub full_symbol: &'a str,
     pub charging_symbol: &'a str,
@@ -32,7 +33,7 @@ impl<'a> Default for BatteryConfig<'a> {
     }
 }
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Default, Serialize)]
 pub struct BatteryDisplayConfig<'a> {
     pub threshold: i64,
     pub style: &'a str,