Move metrics into its own crate

metrics/src/lib.rs

@@ -0,0 +1,16 @@
+pub extern crate influx_db_client;
+#[macro_use]
+extern crate lazy_static;
+extern crate rand;
+extern crate reqwest;
+#[macro_use]
+extern crate log;
+extern crate solana_sdk;
+
+mod metrics;
+pub use metrics::flush;
+pub use metrics::query;
+pub use metrics::set_panic_hook;
+pub use metrics::submit;
+
+pub use influx_db_client as influxdb;