consensus: move amount.h into consensus
Summary:
Move amount.h to consensus/amount.h.
Renames, adds missing and removes uneeded includes.
Also make MAX_MONEY constexpr
This is a backport of core#22951
Test Plan:
ninja all check-all bitcoin-fuzzers bench-bitcoin
grep -r "<amount.h>" src/
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Subscribers: Fabien
Differential Revision: https://reviews.bitcoinabc.org/D12164