Improve config for developing with VSCode Remote Containers

[UFO-101]

Improve config for developing with VSCode Remote Containers, including launch configurations for easy debugging and a task configuration for launching evaluate_loop.sh.

Update README with instructions for using this setup.

[codecov[bot]]

Codecov Report

Merging #72 (26c174b) into main (88774bd) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 26c174b differs from pull request most recent head a5b38c8. Consider uploading reports for the commit a5b38c8 to get more accurate results

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[UFO-101]

Notes:

• The victimplay_launch launch config doesn't work out of the box with current settings because I couldn't find a KataGo config that works for katago victimplay.
• I've updated the victimplay_attach config slightly but it is not used as part of this workflow and should be removed if no one else is using it.