[net processing] Move mapNodeState into PeerManagerImpl
Summary:
Also move a couple of BitcoinABC functions into PeerManagerImpl because they require access to State
This is a partial backport of core#24543
https://github.com/bitcoin/bitcoin/pull/24543/commits/37ecaf3e7a028486a0a1c9b717e8eb4214215805
Depends on D14861
Test Plan: ninja all check-all
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Subscribers: Fabien
Differential Revision: https://reviews.bitcoinabc.org/D14862