Statix Stratego API root scope retrieval

[jessetilro]

Short description
I would like an additional strategy in the Statix Stratego API that retrieves the root scope from the scope graph of a given analysis result.

Problem description.
Current analysis related strategies in the Stratego API operate on a given Scope term, but there is no simple way yet to retrieve the root scope of an analysis to bootstrap the utilization of these strategies.

Describe the solution you'd like
A stx-get-root-scope strategy that maps a given analysis result to the root Scope term would solve this problem.

Describe alternatives you've considered
Retrieving the root Scope term as a property of an AST node is already possible, but this seems more of a workaround as I believe it should still be possible to query the scope graph while disregarding the AST.

Additional context
N/A