Improve the syntax for JSON querying/filtering

[jeancochrane]

One of Ashlar's cool features is that you can query and filter arbitrarily-nested JSON over a REST API. There's been a lot of work in adjacent problem domains since 2015, however, and I think the syntax for the queries could be greatly improved by incorporating some lessons from those domains.

Relevant work includes:

• GraphQL: complex JSON-based web API query language
• glom: library/syntax for nested search of Python dicts

[jeancochrane]

This would still be cool to do, but the value proposition isn't great, so ultimately I'm considering it out of scope for this fellowship.