Fix DataTable conditional style typing

[puneetdixit200]

Summary:

• Add a DataTable typing hook for conditional style props so each entry can include CSS style keys.
• Preserve the generated TypedDict for the conditional if clause.
• Add regression coverage for all four conditional style props.

Tests:

• .venv\Scripts\python -m pytest tests\unit\development\test_dash_table_typing.py -q
• .venv\Scripts\python -m pytest tests\unit\development\test_generate_class.py tests\unit\development\test_metadata_conversions.py -q
• .venv\Scripts\python -m black --check components\dash-table\dash_prop_typing.py tests\unit\development\test_dash_table_typing.py
• .venv\Scripts\python -m flake8 components\dash-table\dash_prop_typing.py tests\unit\development\test_dash_table_typing.py
• git diff --check

Fixes #3342