Add as_packages parameter to find_shortest_chains

[NicholasBunn]

Adds the 'as_packages' option to the 'find_shortest_chains' methods. This allows the importer to be treated as a module rather than a package. The default behaviour is to treat it as a package so as to maintain backwards compatibility

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #157 will not alter performance

_{Comparing NicholasBunn:feature/add_package_support_to_find_shortest_chains (3997312) with master (2b37bd9)}

Summary

✅ 2 untouched benchmarks

[seddonym]

Great stuff! Thanks for all your help.