Use `--build`

Adds an empty changelog file and a reminder to update it when opening
pull requests.

Also, adds a 1.0.0 version number in the package.json, which is what
we _could_ use for version numbering.

Co-authored-by: Aditya Sharad <6874315+adityasharad@users.noreply.github.com>

Add a changelog

(Adding the changelog itself.)

Add the first changelog entry

Fix grouping of the analysis logs, so that custom query logs also get grouped.
Capture the stdout of codeql database analyze, which contains the analysis summary
from summary and diagnostic queries.
Log this output in its own group, along with the baseline computed in the Action.

As produced by npm ci && npm run removeNPMAbsolutePaths.

Analyze: Improve log grouping and log the analysis summary in its own group

Ensure queries[language] objects are initialized

Use --additional-packs instead of --search-path