net: Add -natpmp command line option

Summary:
This is a backport of core#18077 [9/13]
https://github.com/bitcoin/bitcoin/pull/18077/commits/a39f7336a3b493d46a4486c4c94fdca1b3151370

Depends on D12092

Test Plan:

ninja
src/bitcoind -natpmp=1
src/qt/bitcoin-qt -natpmp=1

In bitcoin-qt, go to menu Settings > Options > Network, and check for a message "Options set in this dialog are overridden by the command line or in the configuration file: -natpmp=1"

In the bitcoind output, search for lines containing natpmp:
2022-09-29T14:07:00Z natpmp: The gateway does not support NAT-PMP.

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D12095