Migrate persistent data from user settings to local storage

[t1m0thyj]

Migrate some settings like tree filter history that are persistent data (not really user preferences) from workspace config to local storage.

Resources

• https://www.chrishasz.com/blog/2020/07/28/vscode-how-to-use-local-storage-api/
• https://code.visualstudio.com/api/references/vscode-api#Memento

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