Add Clippy allow directive to generated schema files

This change adds `#![allow(clippy::all)]` to suppress Clippy lints in files generated by the FlatBuffers compiler. These files are auto-generated, so manual linting is unnecessary and could lead to noise during development.

src/bin/schemas/entity_generated.rs

@@ -1,3 +1,4 @@
+#![allow(clippy::all)]
 // automatically generated by the FlatBuffers compiler, do not modify
 
 // @generated

src/bin/schemas/event_generated.rs

@@ -1,3 +1,4 @@
+#![allow(clippy::all)]
 // automatically generated by the FlatBuffers compiler, do not modify
 
 // @generated

src/bin/schemas/metadata_generated.rs

@@ -1,3 +1,4 @@
+#![allow(clippy::all)]
 // automatically generated by the FlatBuffers compiler, do not modify
 
 extern crate flatbuffers;