[rpc] Move DescribeAddressVisitor to rpc/util

Summary:
This is a partial backport of Core PR10583 : https://github.com/bitcoin/bitcoin/pull/10583/commits/1598f32304cd55b83ecc623ee0f9e30b4e087b7d

It was somewhat reworked because the original PR doesn't build at all.

Depends on D3138

Test Plan:

make check
./test/functional/test_runner.py

Reviewers: #bitcoin_abc, markblundeberg

Reviewed By: #bitcoin_abc, markblundeberg

Differential Revision: https://reviews.bitcoinabc.org/D3139