Use style50 as the sole underlying formatter

[rongxin-liu]

Related PR: cs50/style50#130

[Copilot]

Pull request overview

This PR updates the VS Code extension to route formatting through the external style50 CLI (rather than using in-extension formatters), while keeping a C/C++/Java syntax pre-check to prevent running format on code that doesn’t compile.

Changes:

• Removed js-beautify and sql-formatter usage/dependencies and replaced per-language formatting logic with a single style50 -o format ... invocation.
• Kept a clang -fsyntax-only pre-check for C/C++/Java before invoking style50.
• Updated command visibility in package.json to include sql files.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/extension.ts	Removes language-specific formatting logic and delegates formatting output generation to style50, adding small shell-escaping and clang-format-style resolution helpers.
package.json	Updates command “when” clauses (adds sql) and removes formatter dependencies.
package-lock.json	Reflects dependency removals and engine version bump.

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