http: refactor: use encapsulated HTTPRequestTracker

Introduces and uses a HTTPRequestTracker class to keep track of
how many HTTP requests are currently active, so we don't stop the
server before they're all handled.

This has two purposes:
1. In a next commit, allows us to untrack all requests associated
with a connection without running into lifetime issues of the
connection living longer than the request
(see https://github.com/bitcoin/bitcoin/pull/27909#discussion_r1265614783)

2. Improve encapsulation by making the mutex and cv internal members,
and exposing just the WaitUntilEmpty() method that can be safely
used.

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