Solve transitive dependencies in bits with link_options.libraries

Sometimes, bits can depend on some library. In this case, the project that is importing such bit needs to include the depended libraries as well as part of its own compilation.

For example, this is the case of the `mongoose ` bit, that depends on `ssl`. If any project uses `mongoose` then it will also depend on `ssl`.

Start by tracing how link_options.libraries and bit dependencies are represented and propagated. Reproduce the mongoose-to-ssl example in a consuming project, then verify that importing mongoose automatically includes ssl in the consuming project's compilation and linking.

Written by the indexing model from the issue text.