feat: allow for selecting different model-check baseline bundle in local dev mode

[chrispcampbell]

Fixes #244

This improves the check-ui-shell package and the model-check report template used by plugin-check so that it is now possible for the user to save a baseline bundle and select from a list of available bundles in the report header. See screenshot below.

The plugin-check package now exposes an sde-check cli tool that currently only contains one command:

sde-check baseline --save

This will copy the current sde-prep/check-bundle.js file to the baselines directory and rename it to include a timestamp.

The report created by plugin-check will refresh automatically when bundles are added/removed, and the report will also update when the user chooses a new "baseline" or "current" bundle.

As part of this PR, I also made a few usability improvements in the model-check report that I've been wanting to do for some time:

• swapped the dataset colors ("baseline" is now red, "current" is now blue)
• fixed the bundle generated by plugin-check so that it correctly reports the size of the model
• the state of the "Simplify Scenarios" checkbox is preserved when the page is reloaded
• the graph for the first failing check is now expanded/displayed automatically