Move all @codemirror/* packages into peerDependencies

[frenicohansen]

This PR removes the Codemirror packages from direct dependencies and adds them under peerDependencies and devDependencies. By doing so, we ensure that consuming apps manage and install a single, shared instance of CodeMirror, preventing duplicate bundles, version mismatches, and unneeded package bloat.

[gemini-code-assist]

Summary of Changes

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This pull request optimizes dependency management by moving CodeMirror-related packages to peerDependencies. This ensures that consuming applications handle CodeMirror dependencies, preventing duplication and version conflicts, ultimately reducing package bloat.

Highlights

• Dependency Management: Moved @codemirror/* packages and codemirror from dependencies to peerDependencies in package.json.
• Version Pinning: Pinned all @codemirror/* and codemirror peer dependencies to ^6.0.0.
• Bundle Optimization: Ensured consuming apps manage a single instance of CodeMirror to prevent duplicate bundles and version mismatches.

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[gemini-code-assist]

Code Review

This pull request correctly moves CodeMirror packages to peerDependencies, which is a good practice for a library. However, there are two key issues to address: the packages also need to be added to devDependencies to support local development, and the version range for the peer dependencies is too broad, which could cause compatibility issues for consumers. I've left detailed comments with suggestions to fix these.