Drop-in replacement for vscode-json-languageservice

vscode-json-languageservice, the library powering JSON editing in VSCode currently supports only JSON Schema draft-07. The architectural coupling between its validator and editor features means draft support cannot be extended by simply swapping the validator. This project aims at building a drop-in replacement that matches the exact API surface of vscode-json-languageservice while replacing the validator with @hyperjump/json-schema, bringing full support for draft-04 through draft-2020-12. By the end of GSoC, all 13 features of the existing library will be implemented and tested, backed by a MatchingSchemaCollector EvaluationPlugin as the core data layer, a working VSCode extension, and a test suite verifying drop-in compatibility with the existing implementation.