Add support for including development dependency packages in allocations

[andrew]

Highly used development dependencies within an ecosystem need support to, but they often don't have anywhere near the total download and dependency figures as end user packages.

We can expand the list of considered projects by looking at the most depended upon packages in the dev/build/test category for that ecosystem and allocate some percentage out to them.

Similar to #152 we might want a way of configuring what counts as a dev dependency of the ecosystem on a per fund basis, but we might just be able to rely on https://packages.ecosyste.ms/ to do that work for us at a registry level.