GridCommands: implement paging, filter, group commands

[anna-shakhova]

No description provided.

[Copilot]

Pull request overview

This PR expands the internal Grid AI Assistant command surface by adding paging, filtering/searching, and DataGrid-specific grouping commands, along with a small typing refactor to infer executor argument types directly from each command’s Zod schema.

Changes:

• Refined GridCommand typing so command executor args are inferred from the Zod schema (including treating empty-object schemas as no-arg commands).
• Added new grid-core AI assistant commands: paging (paging, pageSize, pageIndex) and filtering (filterValue, clearFilter, searching), with Jest coverage.
• Added DataGrid AI assistant module entrypoint and DataGrid-specific grouping commands (grouping, clearGrouping) with Jest coverage.

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/devextreme/js/__internal/grids/grid_core/ai_assistant/types.ts	Refactors GridCommand to infer executor argument types from the Zod schema (and collapse empty schemas to no-arg executors).
packages/devextreme/js/__internal/grids/grid_core/ai_assistant/commands/sorting.ts	Migrates sorting commands to defineGridCommand and updates the command description.
packages/devextreme/js/__internal/grids/grid_core/ai_assistant/commands/defineGridCommand.ts	Adds a typed helper to preserve schema-based inference when defining commands.
packages/devextreme/js/__internal/grids/grid_core/ai_assistant/commands/paging.ts	Introduces paging-related commands (paging, pageSize, pageIndex).
packages/devextreme/js/__internal/grids/grid_core/ai_assistant/commands/filtering.ts	Introduces filtering/search commands (filterValue, clearFilter, searching) including a recursive filter-expression schema.
packages/devextreme/js/__internal/grids/grid_core/ai_assistant/commands/tests/sorting.test.ts	Small adjustment in an error-throwing test case.
packages/devextreme/js/__internal/grids/grid_core/ai_assistant/commands/tests/paging.test.ts	Adds Jest coverage for paging commands (schema, execution, default messages).
packages/devextreme/js/__internal/grids/grid_core/ai_assistant/commands/tests/filtering.test.ts	Adds Jest coverage for filtering/search commands (schema, execution, default messages).
packages/devextreme/js/__internal/grids/data_grid/m_widget.ts	Switches DataGrid to import the new AI assistant module entrypoint.
packages/devextreme/js/__internal/grids/data_grid/ai_assistant/ai_assistant.ts	Adds the DataGrid aiAssistant module registration (controllers/views + default options).
packages/devextreme/js/__internal/grids/data_grid/ai_assistant/commands/grouping.ts	Adds DataGrid-specific grouping commands (grouping, clearGrouping).
packages/devextreme/js/__internal/grids/data_grid/ai_assistant/commands/tests/grouping.test.ts	Adds Jest coverage for DataGrid grouping commands (schema, execution, default messages).