log: sort logging categories alphabetically

Summary:
Sorting the logging categories seems more user-friendly with the number of categories we now have, allowing CLI users to more quickly find a particular category.

This is a backport of core#22530

Test Plan:

ninja all check-all

src/bitcoind -h | grep -A8 "debug=<category>"
src/bitcoind -daemon && sleep 10 && src/bitcoin-cli logging [] '["addrman"]' && src/bitcoin-cli stop

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D12041