Drop Node v16 and `better-sqlite3` support and add Node v20

[LoicPoullain]

Issue

Support for Node 16 will be dropped in October according to Node.JS LTS schedule.

Also see #1223

Solution and steps

• [x] Remove better-sqlite3
• [x] Remove support for Node 16 and add support for Node 20

Checklist

• [ ] Add/update/check docs (code comments and docs/ folder).
• [x] Add/update/check tests.
• [x] Update/check the cli generators.