Consolidate and Rename Log4j Converter Modules

The `log4j-converter-plugin-descriptor` module serves a very specific and niche purpose:

* Converting `Log4j2Plugins.dat` files to and from JSON.
* Filtering GraalVM reachability metadata to align with the content of `Log4j2Plugins.dat`.

Given the narrow scope of this functionality and the already crowded `org.apache.logging.log4j` namespace, it may not warrant being published as a standalone artifact.

### Proposal:

1. **Move functionality into `log4j-transform-cli`:**
The ability to convert `Log4j2Plugins`.dat files to and from JSON is unlikely to be useful to external Java applications. It would be more appropriate to house it within a dedicated internal package or subcommand of `log4j-transform-cli`.

2. **Rename `log4j-converter-config` to `log4j-config-converter`:**
The current name was chosen for consistency with `log4j-converter-plugin-descriptor`. With the latter being moved, renaming the former improves alignment with Log4j Core 3’s configuration module naming convention (e.g., `log4j-config-properties`, `log4j-config-yaml`). The new name better reflects its purpose and improves coherence across the configuration ecosystem.