Implement SQLiteBatch::StartCursor, ReadAtCursor, and CloseCursor
Summary:
This is a backport of core#19077 [12/26]
https://github.com/bitcoin/bitcoin/pull/19077/commits/f6f9cd6a64842ef23777312f2465e826ca04b88
Depends on D10554
Test Plan:
With Clang-tidy:
ninja
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D10555