internal/logging: Use millisecond time granularity for protocol data file naming (#245)

Reference: #244

Author: bflad

.changelog/245.txt

@@ -0,0 +1,7 @@
+```release-note:bug
+tfprotov5/tf5server: Prevented `TF_LOG_SDK_PROTO_DATA_DIR` file overlap by switching from second to millisecond file naming granularity
+```
+
+```release-note:bug
+tfprotov6/tf6server: Prevented `TF_LOG_SDK_PROTO_DATA_DIR` file overlap by switching from second to millisecond file naming granularity
+```

internal/logging/protocol_data.go

@@ -122,7 +122,7 @@ func protocolDataDynamicValue6(_ context.Context, value *tfprotov6.DynamicValue)
 }
 
 func writeProtocolFile(ctx context.Context, dataDir string, rpc string, message string, field string, fileExtension string, fileContents []byte) {
-	fileName := fmt.Sprintf("%d_%s_%s_%s", time.Now().Unix(), rpc, message, field)
+	fileName := fmt.Sprintf("%d_%s_%s_%s", time.Now().UnixMilli(), rpc, message, field)
 
 	if fileExtension != "" {
 		fileName += "." + fileExtension