Implement GraphQL queries #139
Description
The IFEX interface model (core model, but also layers) is a hierarchical tree.
Therefore, it should be possible to query it using GraphQL, in order to extract things like all the parameters of all the methods, etc. This could be useful for statistics, analysis, and perhaps integration with other GraphQL-capable systems and frameworks.
This is a neat feature that should be reasonably simple to implement using existing GraphQL libraries.