Deprecate -bytespersigop in favor of -bytespersigcheck

Summary:
The -bytespersigop option is still available for now for compatibility, with a deprecation notice.
This is rename-only, there is no change in behavior.

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D12810