Add Clippy lint allowance and default implementation

Added `#![allow(clippy::extra_unused_lifetimes)]` to suppress Clippy warnings in `event_generated.rs`. Implemented `Default` trait for `GeoFenceContract` in `geo_fence_contract.rs` to provide a default constructor.

src/bin/contracts/geo_fence_contract.rs

@@ -25,6 +25,12 @@ pub mod geo_fence_contract {
     #[ink(storage)]
     pub struct GeoFenceContract {}
 
+    impl Default for GeoFenceContract {
+        fn default() -> Self {
+            Self::new()
+        }
+    }
+
     impl GeoFenceContract {
         #[ink(constructor)]
         pub fn new() -> Self {

src/bin/schemas/event_generated.rs

@@ -1,5 +1,5 @@
 // automatically generated by the FlatBuffers compiler, do not modify
-
+#![allow(clippy::extra_unused_lifetimes)]
 // @generated
 
 extern crate flatbuffers;