Constructors, destructors, and relevant private fields for SQLiteDatabase/Batch

Summary:
This is a backport of core#19077 [5/26]
https://github.com/bitcoin/bitcoin/pull/19077/commits/5a488b3d77326a0d957c1233493061da1b6ec207

Depends on D10543

note: unused member SQLiteBatch::m_database commented out to avoid compiler warnings.

Test Plan:
With clang-tidy:
ninja

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10545