Use json v2 directly, move utils to new jsonutil package

[jakebailey]

Originally the json package in our repo contained some shims to adapt behavior, but then I moved everything to just be v2. Now the package serves no purpose, except for a couple of pretty printing helpers.

Those helpers needing to exist seems like a bug to me; probably worth reporting upstream.

[jakebailey]

Ah, the behavior difference is that setting Prefix or Indent also enables multiline printing in v2. It's actually a bug in our code that we are attempting to stringify with empty prefix and indent.

[Copilot]

Pull Request Overview

This PR refactors the JSON handling in the codebase by removing the internal json package wrapper and migrating to direct usage of the github.com/go-json-experiment/json library. The changes include creating a new jsonutil package for pretty printing utilities and updating all imports throughout the codebase.

• Removes the internal json package that was previously serving as a wrapper around github.com/go-json-experiment/json
• Creates a new jsonutil package containing MarshalIndent and MarshalIndentWrite helper functions
• Updates all imports across the codebase to use the JSON v2 library directly

Reviewed Changes

Copilot reviewed 43 out of 43 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
internal/json/json.go	Removes the entire internal JSON wrapper package
internal/jsonutil/jsonutil.go	Creates new utility package with indent marshaling helpers
internal/tsoptions/tsconfigparsing_test.go	Updates imports and function calls to use jsonutil
internal/lsp/lsproto/jsonrpc.go	Changes json.Value to jsontext.Value for RPC parameters
.golangci.yml	Updates linter rule to reference the new direct import
(35+ other files)	Updates imports from internal/json to go-json-experiment/json