Feat: delete mode for geojson editable layers

[moharamfatema]

Pull Request Description

Issue

There is currently no way to delete features from a FeatureCollection via user interaction.

Solution

Introduce a DeleteMode class that extends GeoJsonEditMode. This mode will:

1. Handle user clicks to identify and remove the selected feature(s) from the FeatureCollection.
2. Trigger an onEdit callback to update the collection in the application state.

Implementation

• delete-mode.ts: Implement the DeleteMode class.
• delete-mode.test.ts: Add unit tests to ensure correct functionality.

This will enable users to manage their data more effectively by removing unwanted features.

[ibgreen]

@moharamfatema Thanks for this contribution, I didn't even realize that we were missing this feature.

Please make a pass on the docs as well.

[ibgreen]

https://visgl.github.io/deck.gl-community/docs/CONTRIBUTING#fixing-ci-issues