feat: Add metadata filtering options

[Yahiewi]

This PR adds support for filtering notebook and cell metadata during serialization using Jupytext-style filter strings.

Main changes:

-The default exclusions of cleanCellMetadata in utils.ts now match Jupytext's exact default cell filter: autoscroll, collapsed, scrolled, trusted, and ExecuteTime.
-Implemented filterMetadata in utils.ts supporting wildcards (all/none), exclusion paths (prefixed with -), and dot-notation for nested property evaluation (eg jupytext.text_representation.jupytext_version).
-Declared the shared SerializationOptions interface in notebook.ts
-Serializer Integration:
Updated toMystMd and toPy in to accept options?: SerializationOptions and apply the filters before generating plaintext output.
-Added tests to serialize.test.tsto test different filterMetadata scenarios.

[github-actions]

🎉 This PR is included in version 1.10.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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