Feat 5059

[scottdharvey]

Proposed changes

Currently, protocols.ExecutorOptions.Catalog uses catalog.Catalog while lib.NucleiEngine.Catalog uses *disk.DiskCatalog. However, disk.DiskCatalog satisfies the catalog.Catalog interface by design.

changes:

1. change lib.NucleiEngine.Catalog to catalog.Catalog
2. add a lib.NucleiSDKOptions function UseSuppliedCatalog(cat catalog.Catalog) which assigns the supplied catalog to NucleiEngine.catalog
3. add a nil check to NucleiEngine.init() to use the default disk.DiskCatalog when NucleiEngine.catalog is nil (not assigned by UseSuppliedCatalog`)

#5059

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[GeorginaReeder]

Thanks so much for your contribution @scottdharvey , we really appreciate it!

[tarunKoyalwar]

lgtm ! there shouldn't be any breaking changes for sdk users, since we are only using catalog interface instead of disk catalog struct