refactor: Move trait ConnectorIntegration to crate hyperswitch_interfaces (#4946)

Co-authored-by: Deepanshu Bansal <deepanshu.bansal@Deepanshu-Bansal-K3PYF02LFW.local>

crates/hyperswitch_interfaces/src/metrics.rs

@@ -0,0 +1,16 @@
+//! Metrics interface
+
+use router_env::{counter_metric, global_meter, metrics_context, opentelemetry};
+
+metrics_context!(CONTEXT);
+global_meter!(GLOBAL_METER, "ROUTER_API");
+
+counter_metric!(UNIMPLEMENTED_FLOW, GLOBAL_METER);
+
+/// fn add attributes
+pub fn add_attributes<T: Into<opentelemetry::Value>>(
+    key: &'static str,
+    value: T,
+) -> opentelemetry::KeyValue {
+    opentelemetry::KeyValue::new(key, value)
+}