Connection manager equivalent to prevent DoS attacks

[justindotpub]

Do we need to hook into something with kubo to prevent DoS attacks with repeated http requests coming in? Connection manager may not be the right thing, but it came up in some conversations. Clearly we don't want any connect manager related issues with legit transfers being killed off.

If we do something like this, make sure the core protocol is resilient enough to handle any connection termination and resume where it left off.