Support Querying Results When Query Text is Empty

[Jack251970]

Support Querying Results When Query Text is Empty

Firstly, developers need to implement new interface for their plugins
Then users can see a new toggle button in settings panel titled: Enabled plugin query when query text is empty
FL will query results for all enabled plugins

Close #3256, #19.

1. Add IAsyncEmptyQuery & IEmptyQuery Interfaces

Let plugins developers allow their plugins be queried when query text is empty.

TODO

• Toggle box for every plugin which allows user enable querying when query text is empty.
• Query model.
• History items pin support.
• (Explorer) Explorer favorite files / folders.

[github-actions]

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