fix: handle non-UTF-8 endpoint_name (#243)

* Update offline_wire_formats.proto

Modify endpoint_name from string to bytes

* Update outbound.rs

"endpoint_name: Some(sys_metrics::host::get_hostname()?.into()),

consumes the newly formatted String and returns a Vec<u8>

core_lib/src/hdl/outbound.rs

@@ -226,7 +226,7 @@ impl OutboundRequest {
                 ),
                 connection_request: Some(location_nearby_connections::ConnectionRequestFrame {
                     endpoint_id: Some(String::from_utf8_lossy(&self.endpoint_id).to_string()),
-                    endpoint_name: Some(sys_metrics::host::get_hostname()?),
+                    endpoint_name: Some(sys_metrics::host::get_hostname()?.into()),
                     endpoint_info: Some(
                         RemoteDeviceInfo {
                             name: sys_metrics::host::get_hostname()?,

core_lib/src/proto_src/offline_wire_formats.proto

@@ -76,7 +76,7 @@ message ConnectionRequestFrame {
   // LINT.ThenChange(//depot/google3/third_party/nearby/proto/connections_enums.proto)
 
   optional string endpoint_id = 1;
-  optional string endpoint_name = 2;
+  optional bytes endpoint_name = 2;
   optional bytes handshake_data = 3;
   // A random number generated for each outgoing connection that is presently
   // used to act as a tiebreaker when 2 devices connect to each other