Make it possible to search across all transitive dependencies of a repository

Created by: macraig

Feature request description

As a user I might want to run a search across my repos and their referenced dependencies. In this case it would be useful to have a repo-dependencies keyword filter to define the options while searching across a repo's dependency graph.

For example: repo-dependencies: transitive to search across the repo's entire dependency graph
repo-dependencies:direct to only search among the repo and it's direct dependencies (just one level of depth in the dependency graph) repo-dependencies: exclude optionally exclude any repo dependencies from the search

Another idea would be to add an "N levels of depth" option, to search across the first N levels of the dependency graph.

Additional context

Documenting @olafurpg's feature request idea. Please feel free to add further detail to the issue.