This PR makes all JS db packages to have uniform interface: `new
Database(...)` constructor with explicit `connect()` and `close()`
methods.
Also, this PR adds docstrings in the code and properly support few
better-sqlite options (readonly, fileMustExist, timeout)
Closes#3334
When adding tests for extensions, please follow these guidelines:
Tests that verify the internal logic or behavior of a particular extension should go into cli_tests/extensions.py.
Tests that verify how extensions interact with the database engine, such as virtual table handling, should be written
in TCL (see vtab.test as an example).
To check which extensions are available in TCL, or to add a new one, refer to the tester.tcl file and look at the extension_map.
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