Path query language over JSON documents.

The jsongrep package provides the `jg` command-line tool, a fast and expressive
query engine for JSON data. It supports JSONPath and JMESPath style expressions,
allowing you to filter, transform, and extract data from large JSON files or
streams. Features include:

* Efficient in-memory querying with optional streaming support
* Regex matching, logical predicates, and projections
* JSON output formatting (pretty, compact)
* Cross-platform (Linux, FreeBSD, macOS)