Create separate types for raw results sets

[koesie10]

This creates types for raw result sets which are separate from BQRS types. BQRS types are defined by the CodeQL CLI, while these types can be changed by us. The BQRS types are only used in places where the BQRS is directly used.

It's easiest to review this commit-by-commit. The first 3 commits are the largest commits since they touch a lot of code. All follow-up commits are much smaller.

Checklist

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[robertbrignull]

There's a lot of code changes in this PR, so I haven't been able to go over ever line in high detail, but I've taken a quick look through all the commits and new files and over the general approach. I've also done a very quick test of running some local queries, comparing results, etc...

The changes look good to me. It does have some conflicts that'll need to be resolved.