Remove unnecessary exports from language-json/index.js
- Remove export of getFormatRanges and isJsonSourceElement
- These functions are not imported by any external code
- They are accessed through printer.features.experimental_getRangeNodes
- Printers.js imports them directly from get-format-ranges.js
- All tests passing
Co-authored-by: fisker <172584+fisker@users.noreply.github.com>
