add scaffolding for supporting wal checkpoint

[sonhmai]

add scaffolding for supporting wal checkpoint

• add basic support for parsing pragma wal_checkpoint;
• checkpoint opcode for instruction
• cli test (not active yet)

basically to prepare for adding checkpoint support in the next PRs.

[sonhmai]

The build on windows failed because rexpect is not supported in windows.
This one is only a dev-dependencies for integration testing the CLI.

Will need to look for a way to not building the cli tests in cli/tests in windows.
Although it does not work in windows, I still find that the integration tests of calling through cli written in Rust to be beneficial

1. dev in rust, integration test in rust. no context switching to python or TCL. use cargo for all.
2. advanced testing features (concurrency in tcl tests, etc.) in Rust instead of TCL.

[sonhmai]

resolved the issue by 465f14f.

this PR for scaffold is ready for review. cc @penberg