Pass object instead of multiple strings to routingManager?

[Chaho12]

RoutingManager's provideBackendForRoutingGroup or provideAdhocBackend functions are called in QueryIdCachingProxyHandler.java but within the function, it sends only routing group (if there is a header named "X-Trino-Routing-Group") and user info.

But in request headers, there are much more helpful informations, such as source, catalog, clientTags etc.

So, how about passing an object which includes all headers?