Extend join order badness RA parser

[kaspersv]

To improve readability of RA names, we will soon start using an extended character set for RA names. Quoting using backticks will be used to support pretty-printing and parsing of identifiers with extended characters. This PR extends the join-order evaluator log processor's RA parsing with support for quoted identifiers and brings it in line with the DCA join-order badness RA parser (see referenced PR below).

This PR should have no user visible effect until we start using quoted RA names with extended characters in evaluator logs. I've manually verified that we can still process existing evaluator logs and an evaluator log generated with a pre-release CLI that generates quoted identifiers.

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.

[kaspersv]

@dbartol would you be able to review this PR? It looks like you worked on the initial VS Code join order badness implementation.

[MathiasVP]

The code changes LGTM and matches what we now do on DCA.

I'll let @github/codeql-vscode-reviewers determine what the right process for getting this merged is.

[kaspersv]

@github/codeql-vscode-reviewers Any objections to me merging this PR?