fpp-query: tool for listing files an autocoder will generate

[Kronos3]

This PR includes a new tool fpp-query which is a syntax-only FPP tool for matching to AST nodes and generating file listings. It is essentially a general-purpose version of fpp-filenames which is meant for custom FPP autocoders to provide a very fast CMake configure which needs to query every .fpp file against every FPP autocoder.

I found that when working which Python to provide both autocoding and the configure-stage filenames, CMake configuration (fprime-util generate) slowed down considerably. This tool replaces filename listing step.

It works by traversing the AST looking for configured node kinds to match. Then it converts them into a JSON serde_json::Value and matches a when predicate to them. The predicate uses a simple expression-based DSL to match to different kinds of rules. All the rules are driven by .toml files which are hooked into fpp-query via the --rule option (required)

The tool also comes with some "presets" which provide the same functionality of fpp-filenames and all the option variants of the tool. These presets can be useful for examples/reference.