feat(rome_lsp): pull diagnostics for rome.json

[ematipico]

Summary

This PR adds a minor improvement to the LSP. When the workspace requests diagnostics for a JSON file, we check if the file being analyzed is a rome.json file and attempt to deserialize and return additional diagnostics.

While the schema is already valuable for the majority of the cases:

• sometimes, people don't use the JSON schema, or they are not aware of it;
• there are situations where we run specific validations;

Test Plan

I added a new test case. I also tested locally.

Documentation

• The PR requires documentation
• I will create a new PR to update the documentation

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