refactor: Pass hash_type to CoinsStats in stats object

Summary:
This is a backport of core#19521 [2/17]
https://github.com/bitcoin/bitcoin/pull/19521/commits/9c8a265fd21a87228c18a1661df99fedc1866baf

Depends on D11589

Test Plan: ninja all check-all

Reviewers: #bitcoin_abc, sdulfari

Reviewed By: #bitcoin_abc, sdulfari

Differential Revision: https://reviews.bitcoinabc.org/D11596