refactor: Remove addrdb.h dependency from node.h

Summary:
node.h includes addrdb.h just for the sake of banmap_t type.
This PR makes dependencies simpler and explicit.

This is a backport of Bitcoin Core PR17297

Test Plan: ninja && ninja check

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D7562