Add optional .gitignore support

[tiagoarroz]

Summary

Adds an optional Use .gitignore setting below Repository branch that lets the plugin ignore vault files using root .gitignore rules.

Details

• Adds ignore as a runtime dependency for Git-compatible ignore matching.
• Loads .gitignore rules when metadata is initialized, when local vault events are processed, and when sync actions are calculated.
• Filters ignored local and remote metadata so ignored files are not uploaded, downloaded, or kept in the sync manifest.
• Applies remote .gitignore rules during first sync from a downloaded repository archive.

[tiagoarroz]

This allows for syncing large files with external cloud solutions, e.g. Filen where you can set custom synchronizations, while still being able to sync the notes with this plugin.

1. Create a folder for files
2. Set Obsidian to add the files to that folder by default
3. Add that folder to the .gitignore
4. Sync that folder using a cloud service