Automate MIBiG version detection from uploaded `.pkl` files

[gcroci2]

In NPLinker, we added support for MIBiG v4.0 (#286), which introduces a new metadata schema. The biosynthetic classes have also been updated in v4.0 (see details here).

I have already updated the webapp to support the new biosynthetic classes in this commit (issue #37).

I think it would be beneficial to extract the MIBiG version information directly from the .pkl file uploaded to the dashboard, rather than requiring users to manually select the version. Implementing this would require modifications to the NPLinker codebase, particularly in how npl.config.mibig.version is stored in the .pkl file, ensuring that the correct BGC classes are dynamically selected based on the detected version.