v0.2.1-pre.1

This pre-release much improves eglot integration when working with qlpack based projects.

This is achieved through providing a project.el back-end for codeql projects which will correctly resolve project roots and project-external-roots for the current project. Furthermore, we inhibit re-resolving eglot search paths for qlpacks when following xrefs, such that only a single LSP process is ever active for a given codeql project scope. This significantly improves LSP performance and also prevents superfluous error checking in the LSP server.