feat: implement file-based editing option and update related settings

[felixAnhalt]

This pull request introduces a significant refactor to replace the DiffViewProvider with a new IEditingProvider abstraction across the codebase. Additionally, it adds a new fileBasedEditing setting to the global settings schema. Below are the most important changes grouped by theme:

Refactor: Transition to IEditingProvider

• Replaced DiffViewProvider with IEditingProvider in the Task class, updating its initialization, methods, and references to use the EditingProviderFactory for creation and management. (src/core/task/Task.ts: [1] [2] [3] [4] [5] [6] [7] [8]
• Updated all test files to replace diffViewProvider with editingProvider, ensuring consistency in mock setups and assertions. (src/core/tools/__tests__/applyDiffTool.experiment.spec.ts: [1] src/core/tools/__tests__/insertContentTool.spec.ts: [2] [3] [4] [5] [6] src/core/tools/__tests__/writeToFileTool.spec.ts: [7] [8] [9] [10] [11] [12] [13] [14] [15]
• Refactored the applyDiffToolLegacy function to use editingProvider for operations like opening, updating, and reverting changes. (src/core/tools/applyDiffTool.ts: [1] [2]

New Feature: Global Settings Update

• Added a new fileBasedEditing boolean property to the globalSettingsSchema and initialized it in the EVALS_SETTINGS object with a default value of false. (packages/types/src/global-settings.ts: [1] [2]