types(workspace-imports) Example typings via `NotRequried`

[tony]

Summary by Sourcery

Add example typings for workspace imports by introducing detailed TypedDict schemas and updating importers to reference the new workspace configuration types

Enhancements:

• Define comprehensive TypedDict schemas for shell commands, panes, windows, and workspace configuration using NotRequired for optional fields
• Introduce union types for shell command and pane values to capture both simple and detailed configurations
• Annotate importer functions to reference the WorkspaceConfig type under TYPE_CHECKING and update docstrings to indicate the returned dict conforms to WorkspaceConfig