- Introduced extension methods for recursive serialization and deserialization of nested maps/lists: `toJsonValue()`, `fromJsonValue()`, `toJsonMap()`, `fromJsonMap()`, `toJsonList()`, and `fromJsonList()`.
- Updated README.md to include new utilities.
- Added tests for JSON value extensions.
- Bumped version to 1.4.8.
Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>