```
This removes most transaction request logic from net_processing, and
replaces it with calls to a global TxRequestTracker object.
The major changes are:
* Announcements from outbound (and whitelisted) peers are now always
preferred over those from inbound peers. This used to be the case for
the first request (by delaying the first request from inbound peers),
and a bias afters. The 2s delay for requests from inbound peers still
exists, but after that, if viable outbound peers remain for any given
transaction, they will always be tried first.
* No more hard cap of 100 in flight transactions per peer, as there is
less need for it (memory usage is linear in the number of
announcements, but independent from the number in flight, and CPU
usage isn't affected by it). Furthermore, if only one peer announces a
transaction, and it has over 100 in flight and requestable already, we
still want to request it from them. The cap is replaced with an
additional 2s delay (possibly combined with the existing 2s delays
for inbound connections, and for txid peers when wtxid peers are
available).
Includes functional tests written by Marco Falke and Antoine Riard.
```
Partial backport of core#19988:
https://github.com/bitcoin/bitcoin/pull/19988/commits/242d16477df1a024c7126bad23dde39cad217eca
Depends on D9549.