feat(router): added api for the deleting config key (#3554)

Co-authored-by: Kartikeya Hegde <karthihegde010@gmail.com>
Co-authored-by: dracarys18 <karthikey.hegde@juspay.in>

crates/router_env/src/logger/types.rs

@@ -82,6 +82,8 @@ pub enum Flow {
     ConfigKeyFetch,
     /// ConfigKey Update flow.
     ConfigKeyUpdate,
+    /// ConfigKey Delete flow.
+    ConfigKeyDelete,
     /// Customers create flow.
     CustomersCreate,
     /// Customers retrieve flow.