Can't configure transaction name for aiohttp integration

[asovchar]

Aiohttp integration doesn't allow to configure transaction naming style.
I was trying to configure tracing and filter service endpoints from being reported to Sentry by their routes. Aiohttp integration names transactions after request handler and doesn't support any other naming styles, like other framework's integrations do.

[untitaker]

I saw you opened #876, I left a comment there -- You can always set the transaction manually using sentry_sdk.set_transaction. That's not ideal though.